50278 + Interview Questions in Physics

1.	if net deviation is 180 how the incident ray is antiparllel to the final reflected ray
Answer» if net deviation is 180 how the incident ray is antiparllel to the final reflected ray

Discussion

2.	The correct formula of exhausted permuitit is : (p) Na2Al2Si2O8.xH2O (q) K2Al2Si2O8.xH2O (r) MgAl2Si2O8.xH2O (s) CaAl2Si2O8.xH2O
Answer» The correct formula of exhausted permuitit is : $(p) N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$ $(q) K_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$ $(r) M g A l_{2} S i_{2} O_{8} . x H_{2} O$ $(s) C a A l_{2} S i_{2} O_{8} . x H_{2} O$

2.

The correct formula of exhausted permuitit is : (p) Na2Al2Si2O8.xH2O (q) K2Al2Si2O8.xH2O (r) MgAl2Si2O8.xH2O (s) CaAl2Si2O8.xH2O

Answer»

The correct formula of exhausted permuitit is :

$(p) N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$

$(q) K_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$

$(r) M g A l_{2} S i_{2} O_{8} . x H_{2} O$

$(s) C a A l_{2} S i_{2} O_{8} . x H_{2} O$

Discussion

3.	cubibal block of density2/3g/cc and length a released from position where one of its end just tuches the water of density 1g/cc time period of oscillation should be?
Answer» cubibal block of density2/3g/cc and length a released from position where one of its end just tuches the water of density 1g/cc time period of oscillation should be?

Discussion

4.	the electric field at 2r from the centre of a uniformly charged non conducting sphere of radius r is E . the electric field at distance of r/2 will be?
Answer» the electric field at 2r from the centre of a uniformly charged non conducting sphere of radius r is E . the electric field at distance of r/2 will be?

Discussion

5.	A 12 Ω resistor and an inductor of 0.05π H with negligible resistance are connected in series. Across this combination, an alternating voltage of 130 V,50 Hz is connected. Calculate the rms value of alternating current in the circuit.
Answer» A $12 Ω$ resistor and an inductor of $\frac{0.05}{π} H$ with negligible resistance are connected in series. Across this combination, an alternating voltage of $130 V, 50 Hz$ is connected. Calculate the rms value of alternating current in the circuit.

Discussion

6.	A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest. Calculate (a) the kinetic energy possessed by the bullet (b) the average retarding force offered by the target.
Answer» A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest. Calculate (a) the kinetic energy possessed by the bullet (b) the average retarding force offered by the target.

Discussion

7.	Water (ρ=1000 kg/m3) and kerosene (ρ=800 kg/m3) are filled separately in two identical cylindrical vessels having small heights. Both vessels have small holes at their bottom. The speed of the water and kerosene coming out of their holes are v1 and v2 respectively. Select the correct option.
Answer» Water $(ρ = 1000 {kg/m}^{3})$ and kerosene $(ρ = 800 {kg/m}^{3})$ are filled separately in two identical cylindrical vessels having small heights. Both vessels have small holes at their bottom. The speed of the water and kerosene coming out of their holes are $v_{1}$ and $v_{2}$ respectively. Select the correct option.

Discussion

8.	Where the centre of mass of Obtuse triangular lamina lies ? Explain with diagram .
Answer» Where the centre of mass of Obtuse triangular lamina lies ? Explain with diagram .

Discussion

9.	A plane Electromagnetic wave of frequency 25 MHz travels in free space along the +x direction. At a particular point in space and time, →E=63 ^j V/m. What is →B at this point ?
Answer» A plane Electromagnetic wave of frequency $25 M H z$ travels in free space along the $+ x$ direction. At a particular point in space and time, $\to E = 63^j V / m$ . What is $\to B$ at this point ?

Discussion

10.	A potential of 12.0 volts was applied to two electrodes placed 20 cm apart. A dilute solution of ammonium chloride was placed between the electrodes when NH+4 ions was found to cover a distance of 1.60 cm in one hour. What is the mobility of NH+4 ion?
Answer» A potential of $12.0$ volts was applied to two electrodes placed $20 c m$ apart. A dilute solution of ammonium chloride was placed between the electrodes when $N H_{4}^{+}$ ions was found to cover a distance of $1.60 c m$ in one hour. What is the mobility of $N H_{4}^{+}$ ion?

Discussion

11.	Estimate the order of magnitude of the number of seconds in a century.
Answer» Estimate the order of magnitude of the number of seconds in a century.

Discussion

12.	A short bar magnet is placed with its north pole pointing north. The neutral point is 10 cm away from the cemtre of the magnet.If B_H=0.4 G, calculate the magnetic moment of the magn
Answer» A short bar magnet is placed with its north pole pointing north. The neutral point is 10 cm away from the cemtre of the magnet.If B_H=0.4 G, calculate the magnetic moment of the magn

Discussion

13.	A body of 1 kg makes an elastic collision with a second body at rest and continues to move in the original direction, but with half of its original speed. What is the mass of the second body?
Answer» A body of $1 kg$ makes an elastic collision with a second body at rest and continues to move in the original direction, but with half of its original speed. What is the mass of the second body?

Discussion

14.	Three particles A, B and C, each of mass m, are placed in a line with AB = BC = d. Find the gravitational force on a fourth particle P of same mass, placed at a distance d from the particle B on the perpendicular bisector of the line AC.
Answer» Three particles A, B and C, each of mass m, are placed in a line with AB = BC = d. Find the gravitational force on a fourth particle P of same mass, placed at a distance d from the particle B on the perpendicular bisector of the line AC.

Discussion

15.	A parallel plate capacitor of capacitance 20μF is being charged by a voltage source whose potential is changing at the rate of 3Vs−1. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :
Answer» A parallel plate capacitor of capacitance $20 μ F$ is being charged by a voltage source whose potential is changing at the rate of $3 V s^{- 1}$ . The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :

Discussion

16.	Explain Fleming's right hand thumb rule
Answer» Explain Fleming's right hand thumb rule

Discussion

17.	A Rowland ring of mean radius 15 cm has 3500 turns of wire woundon a ferromagnetic core of relative permeability 800. What is themagnetic field B in the core for a magnetising current of 1.2 A?
Answer» A Rowland ring of mean radius 15 cm has 3500 turns of wire woundon a ferromagnetic core of relative permeability 800. What is themagnetic field B in the core for a magnetising current of 1.2 A?

Discussion

18.	Rectangular channel carries a discharge of 8 cumecs at a depth of 0.9m. the width of channel is 12 m, the alternate depth of flow is _____ m.0.173
Answer» Rectangular channel carries a discharge of 8 cumecs at a depth of 0.9m. the width of channel is 12 m, the alternate depth of flow is _____ m. 0.173

Discussion

19.	Ball A of mass 10 kg moving with a velocity 6 m/s, collides with ball B of mass 50 kg which is at rest. What is the ratio of the kinetic energies of the ball A before and after the collision?
Answer» Ball $A$ of mass $10 kg$ moving with a velocity $6 m/s$ , collides with ball $B$ of mass $50 kg$ which is at rest. What is the ratio of the kinetic energies of the ball $A$ before and after the collision?

Discussion

20.	A gas expands in a closed system from an initial state of 300 kPa and 0.04 m3 to a final state of 126 kPa. If the gas follows pV3=C. What is the work output of the process?
Answer» A gas expands in a closed system from an initial state of 300 kPa and $0.04 m^{3}$ to a final state of 126 kPa. If the gas follows $p V^{3} = C$ . What is the work output of the process?

Discussion

21.	a ball is dropped from the top of a high tower dis†an ce travelled by the ball in 2nd second of its motion is
Answer» a ball is dropped from the top of a high tower dis†an ce travelled by the ball in 2nd second of its motion is

Discussion

22.	if electrostatic force (F) = x²î+yĵ N.if the potential energy is 10J at (1,2) then find the potential energy at (3,4) ?
Answer» if electrostatic force (F) = x²î+yĵ N. if the potential energy is 10J at (1,2) then find the potential energy at (3,4) ?

Discussion

23.	The respective number of significant figures for the numbers 23.023, 0.0003 2.1×10−3 are
Answer» The respective number of significant figures for the numbers 23.023, 0.0003 $2.1 \times 10^{- 3}$ are

Discussion

24.	Temperature variation under steady state heat conduction across a composite slab of two materials with thermal conductivities K1 and K2 having same cross sectional area is shown in figure. Choose the correct statement.
Answer» Temperature variation under steady state heat conduction across a composite slab of two materials with thermal conductivities $K_{1}$ and $K_{2}$ having same cross sectional area is shown in figure. Choose the correct statement.

Discussion

25.	Two identical glass (μg=3/2) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw=4/3). The focal length of the combination is
Answer» Two identical glass $(μ_{g} = 3 / 2)$ equiconvex lenses of focal length $f$ are kept in contact. The space between the two lenses is filled with water $(μ_{w} = 4 / 3)$ . The focal length of the combination is

Discussion

26.	If 2x=y1/5+y−1/5 and (x2−1)d2ydx2+xdydx=ky, then the value of k is
Answer» If $2 x = y^{1 / 5} + y^{- 1 / 5}$ and $(x^{2} - 1) \frac{d^{2} y}{d x^{2}} + x \frac{d y}{d x} = k y,$ then the value of $k$ is

Discussion

27.	In the figure shown, the coefficient of static friction between B and the wall is 23 and the coefficient of kinetic friction between B and the wall is 13. Other contacts are smooth. If the minimum force ′F′ required to lift B up is xmg2, then find x. Mass of A is 2m and the mass of B is m. Take tanθ=34.
Answer» In the figure shown, the coefficient of static friction between $B$ and the wall is $\frac{2}{3}$ and the coefficient of kinetic friction between $B$ and the wall is $\frac{1}{3}$ . Other contacts are smooth. If the minimum force $^{'} F^{'}$ required to lift $B$ up is $\frac{x m g}{2}$ , then find $x$ . Mass of $A$ is $2 m$ and the mass of $B$ is $m$ . Take $tan θ = \frac{3}{4}$ .

Discussion

28.	Six particles situated at the corners of a regular hexagon with side ′a′ move at a constant speed ′v′. Each particle maintains a direction towards the particle at the next corner. The time taken by the particles to meet each other is
Answer» Six particles situated at the corners of a regular hexagon with side $^{'} a^{'}$ move at a constant speed $^{'} v^{'}$ . Each particle maintains a direction towards the particle at the next corner. The time taken by the particles to meet each other is

Discussion

29.	A bar magnet of length l and magnetic dipole moment M is bent to form an arc which subtends an angle of 120∘ at centre. The new magnetic dipole moment will be
Answer» A bar magnet of length $l$ and magnetic dipole moment $M$ is bent to form an arc which subtends an angle of $120^{\circ}$ at centre. The new magnetic dipole moment will be

Discussion

30.	The circuit shown in figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connnected as follows:For 2nT≤t<(2n+1)T,(n=0,1,2...) S1 to P1 and S2 to P2For (2n+1)T≤t<(2n+2)T,(n=0,1,2,......) S1 to Q1 and S2 to Q2Assume that the capacitor has zero intial charge. Given that u(t) is a uint step function, the voltage Vc(t) across the capacitor is given by
Answer» The circuit shown in figure is used to charge the capacitor C alternately from two current sources as indicated. The switches $S_{1}$ and $S_{2}$ are mechanically coupled and connnected as follows: For $2 n T \leq t < (2 n + 1) T, (n = 0, 1, 2...) S_{1} t o P_{1} a n d S_{2} t o P_{2}$ For $(2 n + 1) T \leq t < (2 n + 2) T, (n = 0, 1, 2, . . . . . .) S_{1} t o Q_{1} a n d S_{2} t o Q_{2}$ Assume that the capacitor has zero intial charge. Given that u(t) is a uint step function, the voltage $V_{c} (t)$ across the capacitor is given by

Discussion

31.	In uniform circular motion kinetic energy why not variable since the velocity is changing?
Answer» In uniform circular motion kinetic energy why not variable since the velocity is changing ?

Discussion

32.	ntA man pulls a bucket full of water from h metre deep well . If the mass of rope is m and mass of bucket full of water is M , then work done by the man is ?n
Answer» ntA man pulls a bucket full of water from h metre deep well . If the mass of rope is m and mass of bucket full of water is M , then work done by the man is ?n

Discussion

33.	Two small electric dipoles each of dipole moment p are situated at (0,0,0) and (r,0,0). The electric potential at a point (r2,√3r2,0) is
Answer» Two small electric dipoles each of dipole moment $p$ are situated at $(0, 0, 0)$ and $(r, 0, 0)$ . The electric potential at a point $(\frac{r}{2}, \frac{\sqrt{3} r}{2}, 0)$ is

Discussion

34.	In electric field due to linear charge distribution. When the rod is placed along y axis, Given that Ey= klambda/a( cos alpha - cos beta) While explaining cases like alpha = beta = 0, etc it's given that Ey = k lambda /a ( cosbeta - cos alpha). Which one is correct?
Answer» In electric field due to linear charge distribution. When the rod is placed along y axis, Given that Ey= klambda/a( cos alpha - cos beta) While explaining cases like alpha = beta = 0, etc it's given that Ey = k lambda /a ( cosbeta - cos alpha). Which one is correct?

Discussion

35.	(a) Calculate E∘cell for the following reaction at 298 K: 2Cr(s)+3Fe2+(0.01 M)→2Cr3+(0.01M)+3Fe(s) Given : Ecell=0.261V (b) Using the E∘ values of A and B, predict which one is better for coating the surface of iron [Eo(Fe2+/Fe)=−0.44V] to prevent corrosion and why? Given: E∘(A2+/A)=−2.37V: E∘(B2+/B)=−0.14V
Answer» (a) Calculate $E_{c e l l}^{\circ}$ for the following reaction at 298 K: $2 C r (s) + 3 F e^{2 +} (0.01 M) \to 2 C r^{3 +} (0.01 M) + 3 F e (s)$ Given : $E_{c e l l} = 0.261 V$ (b) Using the $E^{\circ}$ values of A and B, predict which one is better for coating the surface of iron $[E^{o} (F e^{2 +} / F e) = - 0.44 V]$ to prevent corrosion and why? Given: $E^{\circ} (A^{2 +} / A) = - 2.37 V$ : $E^{\circ} (B^{2 +} / B) = - 0.14 V$

Discussion

36.	9.Four solid spheres each of mass m and radius r are placed on the vertices of a square of side length a (a>2r) 1) the Moment of inertia of the system about an axis passing through diagnoal of the square will be. 2) The MI of the system about an axis passing through centre of one of the spheres and perpendicular to the plane of square will be.
Answer» 9.Four solid spheres each of mass m and radius r are placed on the vertices of a square of side length a (a>2r) 1) the Moment of inertia of the system about an axis passing through diagnoal of the square will be. 2) The MI of the system about an axis passing through centre of one of the spheres and perpendicular to the plane of square will be.

Discussion

37.	A wire of mass m and length l can freely slide on a pair of parallel, smooth, horizontal rails placed in a vertical uniform magnetic field B. The rails are connected by a capacitor of capacitance C. The electric resistance of the rails and the wire is zero. If a constant force F acts on the wire as shown in the figure, find the acceleration of the wire.
Answer» A wire of mass $m$ and length $l$ can freely slide on a pair of parallel, smooth, horizontal rails placed in a vertical uniform magnetic field $B$ . The rails are connected by a capacitor of capacitance $C$ . The electric resistance of the rails and the wire is zero. If a constant force $F$ acts on the wire as shown in the figure, find the acceleration of the wire.

Discussion

38.	Suppose that the particle in Exercise in 1.33 is an electron projectedwith velocity vx = 2.0 × 106 m s–1. If E between the plates separatedby 0.5 cm is 9.1 × 102 N/C, where will the electron strike the upperplate? (\|e\|=1.6 × 10–19 C, me = 9.1 × 10–31 kg.)
Answer» Suppose that the particle in Exercise in 1.33 is an electron projectedwith velocity vx = 2.0 × 106 m s–1. If E between the plates separatedby 0.5 cm is 9.1 × 102 N/C, where will the electron strike the upperplate? (\|e\|=1.6 × 10–19 C, me = 9.1 × 10–31 kg.)

Discussion

39.	A potentiometer wire has 10 m length and 10 Ω resistance. A battery of E = 2 volt and a rheostat is connected to it. If the potential gradient is 1 μV/mm, the value of resistance in rheostat in ohm will be
Answer» A potentiometer wire has $10 m$ length and $10$ $Ω$ resistance. A battery of $E$ $=$ $2 volt$ and a rheostat is connected to it. If the potential gradient is $1$ $μ$ $V$ / $mm$ , the value of resistance in rheostat in $ohm$ will be

Discussion

40.	Find the extention in the spring, if mass of the block is 6 kg and spring constant of the spring is 120 N/m. [Take g=10 m/s2]
Answer» Find the extention in the spring, if mass of the block is $6 kg$ and spring constant of the spring is $120 N/m$ . [Take $g = 10 {m/s}^{2}$ ]

Discussion

41.	When a particle is thrown upward . What will be the graph for displacement vs time and velocity vs time?
Answer» When a particle is thrown upward . What will be the graph for displacement vs time and velocity vs time?

Discussion

42.	Potential energy is defined } a. Only in conservative field } b.As the negative of work done by conservative } forces } c.As the negative of workdone by external } forces when }Δ K=0 dAll of these
Answer» Potential energy is defined } a. Only in conservative field } b.As the negative of work done by conservative } forces } c.As the negative of workdone by external } forces when }Δ K=0 dAll of these

Discussion

43.	The recoil speed of a free H-atom at rest in fourth excited state, when it undergoes a transition to ground state is (mass of the H atom = 1.67×10−27 kg and assume exciting energy is taken by the atom)(write upto two decimal places) in m/s is [Take h=6.68×10−34 Js and RH=1×107 m−1]
Answer» The recoil speed of a free H-atom at rest in fourth excited state, when it undergoes a transition to ground state is (mass of the H atom = $1.67 \times 10^{- 27}$ kg and assume exciting energy is taken by the atom)(write upto two decimal places) in $m / s$ is [Take $h = 6.68 \times 10^{- 34} J s$ and $R_{H} = 1 \times 10^{7} m^{- 1}$ ]

Discussion

44.	The pitch of a screw gauge is 2 mm and there are 100 divisions on the circular scale. In measuring the diameter of a sphere, there are 6 divisions on the linear scale and 40 divisions on circular scale coinciding with the reference line. The diameter of the sphere is:
Answer» The pitch of a screw gauge is $2 mm$ and there are $100$ divisions on the circular scale. In measuring the diameter of a sphere, there are $6$ divisions on the linear scale and $40$ divisions on circular scale coinciding with the reference line. The diameter of the sphere is:

Discussion

45.	In the circuit shown in figure switch Sis closed at time t=0. Let i1 and i2 be the currents at any finite time t then the ratio i1i2
Answer» In the circuit shown in figure switch $S$ is closed at time $t = 0$ . Let $i_{1}$ and $i_{2}$ be the currents at any finite time $t$ then the ratio $\frac{i_{1}}{i_{2}}$

Discussion

46.	A car increases its speed from 20 km/h to 30 km/h in 1 s then its acceleration is -
Answer» A car increases its speed from $20 km/h$ to $30 km/h$ in $1 s$ then its acceleration is -

Discussion

47.	Two particles A and B are projected in air. A is thrown with a speed of 60 m/sec and B with a speed of 80 m/sec as shown in the figure. What is the separation between them after 2 sec?
Answer» Two particles $A$ and $B$ are projected in air. $A$ is thrown with a speed of $60 m / s e c$ and $B$ with a speed of $80 m / s e c$ as shown in the figure. What is the separation between them after $2 s e c$ ?

Discussion

48.	The transverse displacement of a string (clamped at its both ends)is given byWhere x and y are in m and t in s. The lengthof the string is 1.5 m and its mass is 3.0 ×10–2kg.Answer the following:(a) Does the function represent a travelling wave or a stationarywave?(b) Interpret the wave as a superposition of two waves travellingin opposite directions. What is the wavelength, frequency, and speedof each wave?(c) Determine the tension in the string.
Answer» The transverse displacement of a string (clamped at its both ends) is given by Where x and y are in m and t in s. The length of the string is 1.5 m and its mass is 3.0 ×10^–2 kg. Answer the following: (a) Does the function represent a travelling wave or a stationary wave? (b) Interpret the wave as a superposition of two waves travelling in opposite directions. What is the wavelength, frequency, and speed of each wave? (c) Determine the tension in the string.

48.

The transverse displacement of a string (clamped at its both ends)is given byWhere x and y are in m and t in s. The lengthof the string is 1.5 m and its mass is 3.0 ×10–2kg.Answer the following:(a) Does the function represent a travelling wave or a stationarywave?(b) Interpret the wave as a superposition of two waves travellingin opposite directions. What is the wavelength, frequency, and speedof each wave?(c) Determine the tension in the string.

Answer»

The transverse displacement of a string (clamped at its both ends)
is given by

Where x and y are in m and t in s. The length
of the string is 1.5 m and its mass is 3.0 ×10^–2
kg.

Answer the following:

(a) Does the function represent a travelling wave or a stationary
wave?

(b) Interpret the wave as a superposition of two waves travelling
in opposite directions. What is the wavelength, frequency, and speed
of each wave?

(c) Determine the tension in the string.

Discussion

49.	A ball is thrown up vertically with speed u. At the same instant another ball b is released from rest at height h vertically above the point of projection A taking the moment of projection of A .Taking the moment of projection as t=0 and acceleration due to gravity is g at the momment of collision the position of a is at a distance?
Answer» A ball is thrown up vertically with speed u. At the same instant another ball b is released from rest at height h vertically above the point of projection A taking the moment of projection of A .Taking the moment of projection as t=0 and acceleration due to gravity is g at the momment of collision the position of a is at a distance?

Discussion

50.	In the figure shown "O" represents the point object. Find the coordinates of the image formed by the plane mirror .
Answer» In the figure shown " $O$ " represents the point object. Find the coordinates of the image formed by the plane mirror .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

if net deviation is 180 how the incident ray is antiparllel to the final reflected ray

The correct formula of exhausted permuitit is : (p) Na2Al2Si2O8.xH2O (q) K2Al2Si2O8.xH2O (r) MgAl2Si2O8.xH2O (s) CaAl2Si2O8.xH2O

cubibal block of density2/3g/cc and length a released from position where one of its end just tuches the water of density 1g/cc time period of oscillation should be?

the electric field at 2r from the centre of a uniformly charged non conducting sphere of radius r is E . the electric field at distance of r/2 will be?

A 12 Ω resistor and an inductor of 0.05π H with negligible resistance are connected in series. Across this combination, an alternating voltage of 130 V,50 Hz is connected. Calculate the rms value of alternating current in the circuit.

A bullet of mass 50 g is moving with a velocity of 500 m/s. If it penetrates into a 10 cm still target and comes to rest. Calculate (a) the kinetic energy possessed by the bullet (b) the average retarding force offered by the target.

Water (ρ=1000 kg/m3) and kerosene (ρ=800 kg/m3) are filled separately in two identical cylindrical vessels having small heights. Both vessels have small holes at their bottom. The speed of the water and kerosene coming out of their holes are v1 and v2 respectively. Select the correct option.

Where the centre of mass of Obtuse triangular lamina lies ? Explain with diagram .

A plane Electromagnetic wave of frequency 25 MHz travels in free space along the +x direction. At a particular point in space and time, →E=63 ^j V/m. What is →B at this point ?

A potential of 12.0 volts was applied to two electrodes placed 20 cm apart. A dilute solution of ammonium chloride was placed between the electrodes when NH+4 ions was found to cover a distance of 1.60 cm in one hour. What is the mobility of NH+4 ion?

Estimate the order of magnitude of the number of seconds in a century.

A short bar magnet is placed with its north pole pointing north. The neutral point is 10 cm away from the cemtre of the magnet.If B_H=0.4 G, calculate the magnetic moment of the magn

A body of 1 kg makes an elastic collision with a second body at rest and continues to move in the original direction, but with half of its original speed. What is the mass of the second body?

Three particles A, B and C, each of mass m, are placed in a line with AB = BC = d. Find the gravitational force on a fourth particle P of same mass, placed at a distance d from the particle B on the perpendicular bisector of the line AC.

A parallel plate capacitor of capacitance 20μF is being charged by a voltage source whose potential is changing at the rate of 3Vs−1. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :

Explain Fleming's right hand thumb rule

A Rowland ring of mean radius 15 cm has 3500 turns of wire woundon a ferromagnetic core of relative permeability 800. What is themagnetic field B in the core for a magnetising current of 1.2 A?

Rectangular channel carries a discharge of 8 cumecs at a depth of 0.9m. the width of channel is 12 m, the alternate depth of flow is _____ m.0.173

Ball A of mass 10 kg moving with a velocity 6 m/s, collides with ball B of mass 50 kg which is at rest. What is the ratio of the kinetic energies of the ball A before and after the collision?

A gas expands in a closed system from an initial state of 300 kPa and 0.04 m3 to a final state of 126 kPa. If the gas follows pV3=C. What is the work output of the process?

a ball is dropped from the top of a high tower dis†an ce travelled by the ball in 2nd second of its motion is

if electrostatic force (F) = x²î+yĵ N.if the potential energy is 10J at (1,2) then find the potential energy at (3,4) ?

The respective number of significant figures for the numbers 23.023, 0.0003 2.1×10−3 are

Temperature variation under steady state heat conduction across a composite slab of two materials with thermal conductivities K1 and K2 having same cross sectional area is shown in figure. Choose the correct statement.

Two identical glass (μg=3/2) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw=4/3). The focal length of the combination is

If 2x=y1/5+y−1/5 and (x2−1)d2ydx2+xdydx=ky, then the value of k is

Six particles situated at the corners of a regular hexagon with side ′a′ move at a constant speed ′v′. Each particle maintains a direction towards the particle at the next corner. The time taken by the particles to meet each other is

A bar magnet of length l and magnetic dipole moment M is bent to form an arc which subtends an angle of 120∘ at centre. The new magnetic dipole moment will be

In uniform circular motion kinetic energy why not variable since the velocity is changing?

ntA man pulls a bucket full of water from h metre deep well . If the mass of rope is m and mass of bucket full of water is M , then work done by the man is ?n

Two small electric dipoles each of dipole moment p are situated at (0,0,0) and (r,0,0). The electric potential at a point (r2,√3r2,0) is

In electric field due to linear charge distribution. When the rod is placed along y axis, Given that Ey= klambda/a( cos alpha - cos beta) While explaining cases like alpha = beta = 0, etc it's given that Ey = k lambda /a ( cosbeta - cos alpha). Which one is correct?

Suppose that the particle in Exercise in 1.33 is an electron projectedwith velocity vx = 2.0 × 106 m s–1. If E between the plates separatedby 0.5 cm is 9.1 × 102 N/C, where will the electron strike the upperplate? (|e|=1.6 × 10–19 C, me = 9.1 × 10–31 kg.)

A potentiometer wire has 10 m length and 10 Ω resistance. A battery of E = 2 volt and a rheostat is connected to it. If the potential gradient is 1 μV/mm, the value of resistance in rheostat in ohm will be

Find the extention in the spring, if mass of the block is 6 kg and spring constant of the spring is 120 N/m. [Take g=10 m/s2]

When a particle is thrown upward . What will be the graph for displacement vs time and velocity vs time?

Potential energy is defined } a. Only in conservative field } b.As the negative of work done by conservative } forces } c.As the negative of workdone by external } forces when }Δ K=0 dAll of these

The recoil speed of a free H-atom at rest in fourth excited state, when it undergoes a transition to ground state is (mass of the H atom = 1.67×10−27 kg and assume exciting energy is taken by the atom)(write upto two decimal places) in m/s is [Take h=6.68×10−34 Js and RH=1×107 m−1]

The pitch of a screw gauge is 2 mm and there are 100 divisions on the circular scale. In measuring the diameter of a sphere, there are 6 divisions on the linear scale and 40 divisions on circular scale coinciding with the reference line. The diameter of the sphere is:

In the circuit shown in figure switch Sis closed at time t=0. Let i1 and i2 be the currents at any finite time t then the ratio i1i2

A car increases its speed from 20 km/h to 30 km/h in 1 s then its acceleration is -

Two particles A and B are projected in air. A is thrown with a speed of 60 m/sec and B with a speed of 80 m/sec as shown in the figure. What is the separation between them after 2 sec?

In the figure shown "O" represents the point object. Find the coordinates of the image formed by the plane mirror .