50278 + Interview Questions in Physics

1.	A proton goes undeflected in a crossed electric and magnetic field (the fields are perpendicular to each other) at a speed of 2.0×105 m s−1. The velocity is perpendicular to both the fields. When the electric field is switched off, the proton moves along a circle of radius 4.0 cm. Find the magnitudes of the electric and the magnetic fields. Take the mass of the proton =1.6×10−27 kg.
Answer» A proton goes undeflected in a crossed electric and magnetic field (the fields are perpendicular to each other) at a speed of $2.0 \times 10^{5} m s^{- 1} .$ The velocity is perpendicular to both the fields. When the electric field is switched off, the proton moves along a circle of radius 4.0 cm. Find the magnitudes of the electric and the magnetic fields. Take the mass of the proton $= 1.6 \times 10^{- 27} k g .$

Discussion

2.	Keeping the voltage of charging source cons†an t, what would be the percentage change in the energy stored in a parallel plate capacitor if the separation between the plates were to be increased by 10%
Answer» Keeping the voltage of charging source cons†an t, what would be the percentage change in the energy stored in a parallel plate capacitor if the separation between the plates were to be increased by 10%

Discussion

3.	A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h . Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h . The average speed of the man over the interval of time 0 to 40 min is equal to
Answer» A man walks on a straight road from his home to a market $2.5 k m$ away with a speed of $5 k m / h$ . Finding the market closed, he instantly turns and walks back home with a speed of $7.5 k m / h$ . The average speed of the man over the interval of time $0 t o 40 m i n$ is equal to

Discussion

4.	A system of coordinates is drawn in a medium whose refractive index varies as μ=21+y2, where 0≤y≤1 and μ=2 for y<0 as shown in figure. A ray of light is incident at origin at an angle 60∘ with y - axis as shown in the figure. At point P, ray becomes parallel to x - axis. The value of H is:-
Answer» A system of coordinates is drawn in a medium whose refractive index varies as $μ = \frac{2}{1 + y^{2}}$ , where $0 \leq y \leq 1$ and $μ = 2$ for $y < 0$ as shown in figure. A ray of light is incident at origin at an angle $60^{\circ}$ with y - axis as shown in the figure. At point $P$ , ray becomes parallel to x - axis. The value of $H$ is:-

Discussion

5.	Two stones are thrown up simultaneously from the edge of a cliff 200 m high with initial speeds of 15 m/s and 30 m/s. Verify that the graph shown in Fig. 3.27 correctly represents the time variation of the relative position of the second stone with respect to the first. Neglect air resistance and assume that the stones do not rebound after hitting the ground. Take g=10m/s2. Give the equations for the linear and curved parts of the plot.
Answer» Two stones are thrown up simultaneously from the edge of a cliff 200 m high with initial speeds of 15 m/s and 30 m/s. Verify that the graph shown in Fig. 3.27 correctly represents the time variation of the relative position of the second stone with respect to the first. Neglect air resistance and assume that the stones do not rebound after hitting the ground. Take $g = 10 m / s^{2}$ . Give the equations for the linear and curved parts of the plot.

Discussion

6.	A particle of mass m attached to a string of length l is describing circular motion on a smooth plane inclined at an angle α with the horizontal. For the particle to complete the loop, its velocity at the lowest point should exceed
Answer» A particle of mass $m$ attached to a string of length $l$ is describing circular motion on a smooth plane inclined at an angle $α$ with the horizontal. For the particle to complete the loop, its velocity at the lowest point should exceed

Discussion

7.	The displacement of the particle (in m) is given by y=2t+t2−2t3 What is the velocity (in m/s) of the particle at the instant when its acceleration is zero?
Answer» The displacement of the particle (in $m$ ) is given by $y = 2 t + t^{2} - 2 t^{3}$ What is the velocity (in $m / s$ ) of the particle at the instant when its acceleration is zero?

7.

The displacement of the particle (in m) is given by y=2t+t2−2t3 What is the velocity (in m/s) of the particle at the instant when its acceleration is zero?

Answer»

The displacement of the particle (in $m$ ) is given by

$y = 2 t + t^{2} - 2 t^{3}$

What is the velocity (in $m / s$ ) of the particle at the instant when its acceleration is zero?

Discussion

8.	what is the difference between these 4 terms:1)pressure2)partial pressure3)partial vapour pressure4)vapour pressure
Answer» what is the difference between these 4 terms: 1)pressure 2)partial pressure 3)partial vapour pressure 4)vapour pressure

Discussion

9.	For the system shown in the figure, the position of the final image of object O is[Assume origin of co-ordinate system to be at optical centre of half convex lens]
Answer» For the system shown in the figure, the position of the final image of object $O$ is [Assume origin of co-ordinate system to be at optical centre of half convex lens]

Discussion

10.	Two bodies are held separated by 9.8 m vertically one above the other. They are released simultaneously to fall freely under gravity. After 2 s the relative distance between them is
Answer» Two bodies are held separated by $9.8 m$ vertically one above the other. They are released simultaneously to fall freely under gravity. After $2 s$ the relative distance between them is

Discussion

11.	A particle of mass m and charge+q1 moves diametrically through a uniformly charged sphere of radius R with total charge -q2. If +q1 performs SHM, then its time period is?
Answer» A particle of mass m and charge+q1 moves diametrically through a uniformly charged sphere of radius R with total charge -q2. If +q1 performs SHM, then its time period is?

Discussion

12.	97.A cyclotron with radius R and magnetic field B is used to accelerate charge q and mass m. If voltage between the dees is V0. Find number of revolution performed by charge before it leaves cyclotron.
Answer» 97.A cyclotron with radius R and magnetic field B is used to accelerate charge q and mass m. If voltage between the dees is V0. Find number of revolution performed by charge before it leaves cyclotron.

Discussion

13.	a stone of mass 0.2 kg is tied to one end of a string of length 80 cm. holding the other end the stone is whiled into a vertical circle. the min speed of the stone and tension at the lowest point of circular path so that it just completes the circle ar
Answer» a stone of mass 0.2 kg is tied to one end of a string of length 80 cm. holding the other end the stone is whiled into a vertical circle. the min speed of the stone and tension at the lowest point of circular path so that it just completes the circle ar

Discussion

14.	Absolute zero temperature is not the temperature of zero energy why?
Answer» Absolute zero temperature is not the temperature of zero energy why?

Discussion

15.	Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now becomes-
Answer» Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is $r$ . Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now becomes-

Discussion

16.	An AC voltage source described by V=10cos(π2)t is connected to a 1 μF capacitor as shown in figure. The key K is closed at t=0. The time (t>0) after which the magnitude of current I reaches its maximum value for the first time is
Answer» An $A C$ voltage source described by $V = 10 cos (\frac{π}{2}) t$ is connected to a $1 μ F$ capacitor as shown in figure. The key $K$ is closed at $t = 0$ . The time $(t > 0)$ after which the magnitude of current $I$ reaches its maximum value for the first time is

Discussion

17.	A body cools in 7 minutes from 60∘C to 40∘C. What will be its temperature after next 7 minutes, if the temperature of the surroundings is 10∘C?
Answer» A body cools in $7$ minutes from $60^{\circ} C$ to $40^{\circ} C$ . What will be its temperature after next $7$ minutes, if the temperature of the surroundings is $10^{\circ} C$ ?

Discussion

18.	Gravitational acceleration on the surface of a planet is √611g, where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 23 times that of the earth. If the escape speed on the surface of the earth is taken to be 11 kms−1, the escape speed on the surface of the planet in kms−1 will be
Answer» Gravitational acceleration on the surface of a planet is $\frac{\sqrt{6}}{11} g,$ where $g$ is the gravitational acceleration on the surface of the earth. The average mass density of the planet is $\frac{2}{3}$ times that of the earth. If the escape speed on the surface of the earth is taken to be $11 {kms}^{- 1}$ , the escape speed on the surface of the planet in ${kms}^{- 1}$ will be

Discussion

19.	Why magnetic field is created due a current carrying conductor?
Answer» Why magnetic field is created due a current carrying conductor?

Discussion

20.	If αr and αt represent radial and tangential accelerations, the motion of a particle will be uniformly circular if
Answer» If $α_{r}$ and $α_{t}$ represent radial and tangential accelerations, the motion of a particle will be uniformly circular if

Discussion

21.	In the given figure coefficient of friction between m and M is 0.25. Everywhere else friction is zero. If M = 2m and θ=37∘, then acceleration of M is
Answer» In the given figure coefficient of friction between m and M is 0.25. Everywhere else friction is zero. If M = 2m and $θ = 37^{\circ}$ , then acceleration of M is

Discussion

22.	0.48 gram of a volatile gas upon vapourisation gives 90 ml of Vapour at NTP what will be the vapour density of the substance is
Answer» 0.48 gram of a volatile gas upon vapourisation gives 90 ml of Vapour at NTP what will be the vapour density of the substance is

Discussion

23.	In an AC circuit, the instantaneous emf and current are given by e=100sin30t,i=20sin(30t−π4). In one cycle of AC, the average power consumed by the circuit in watt and the wattless current in amperes are, respectively –
Answer» In an AC circuit, the instantaneous emf and current are given by $e = 100 sin 30 t, i = 20 sin (30 t - \frac{π}{4})$ . In one cycle of AC, the average power consumed by the circuit in watt and the wattless current in amperes are, respectively –

Discussion

24.	Mark the correct options looking to the given Maxwell’s distribution Curve.
Answer» Mark the correct options looking to the given Maxwell’s distribution Curve.

Discussion

25.	29.The coefficient of performance of a refrigerator working between 10^° C and 20^° C is - A. 1 B. 28.3 C. 29.3 D. 3.53
Answer» 29.The coefficient of performance of a refrigerator working between 10^° C and 20^° C is - A. 1 B. 28.3 C. 29.3 D. 3.53

Discussion

26.	In a series resonant LCR circuit, the voltage across resistor R is 100 V and R=1 kΩ with C=2 μF. The resonant frequency ω is 200 rad/s. At resonance, the voltage across L is
Answer» In a series resonant $L C R$ circuit, the voltage across resistor $R$ is $100 V$ and $R = 1 k Ω$ with $C = 2 μ F$ . The resonant frequency $ω$ is $200 rad/s$ . At resonance, the voltage across $L$ is

Discussion

27.	A 5 m long cylindrical steel wire with radius 2×10−3 m is suspended vertically from a rigid support and carries a bob of mass 100 kg at the other end. If the bob gets snapped,The change in temperature of the wire is (x×10−3)∘C (ignoring radiation losses). Find the value of x.(For the steel wire: Young's modulus =2.1×1011 N/m2); Density =7860 kg/m3; Specific heat =420 J/kg-∘C
Answer» A $5 m$ long cylindrical steel wire with radius $2 \times 10^{- 3} m$ is suspended vertically from a rigid support and carries a bob of mass $100 kg$ at the other end. If the bob gets snapped,The change in temperature of the wire is ${(x \times 10^{- 3})}^{\circ} C$ (ignoring radiation losses). Find the value of $x$ . (For the steel wire: Young's modulus $= 2.1 \times 10^{11} {N/m}^{2}$ ); Density $= 7860 {kg/m}^{3}$ ; Specific heat $= 420 {J/kg-}^{\circ} C$

Discussion

28.	A cell develops the same power across two resistance R1 and R2 separately. The internal resistance of the cell is-
Answer» A cell develops the same power across two resistance $R_{1}$ and $R_{2}$ separately. The internal resistance of the cell is-

Discussion

29.	A point charge causes an electric flux of –1.0 × 103 Nm2/C to pass through a spherical Gaussian surface of 10.0 cm radius centred onthe charge. (a) If the radius of the Gaussian surface were doubled,how much flux would pass through the surface? (b) What is thevalue of the point charge?
Answer» A point charge causes an electric flux of –1.0 × 103 Nm2/C to pass through a spherical Gaussian surface of 10.0 cm radius centred onthe charge. (a) If the radius of the Gaussian surface were doubled,how much flux would pass through the surface? (b) What is thevalue of the point charge?

Discussion

30.	The position of the particle is given by x=t2+5t+2 in m. The average speed of the particle in 6 sec is
Answer» The position of the particle is given by $x = t^{2} + 5 t + 2$ in $m$ . The average speed of the particle in $6 sec$ is

Discussion

31.	Derivative of f(x)=xsin(√x) is
Answer» Derivative of $f (x) = x sin (\sqrt{x})$ is

Discussion

32.	Three rods of identical area of cross-section and made from the same metal form the sides of an isosceles triangle ABC , right angled at B. The points A and B are maintained at temperatures T and √2T respectively. In the steady state the temperature of the point C is Tc. Assuming that only heat conduction takes place, TCT is equal to
Answer» Three rods of identical area of cross-section and made from the same metal form the sides of an isosceles triangle ABC , right angled at B. The points A and B are maintained at temperatures T and $\sqrt{2}$ T respectively. In the steady state the temperature of the point C is $T_{c}$ . Assuming that only heat conduction takes place, $\frac{T_{C}}{T}$ is equal to

32.

Three rods of identical area of cross-section and made from the same metal form the sides of an isosceles triangle ABC , right angled at B. The points A and B are maintained at temperatures T and √2T respectively. In the steady state the temperature of the point C is Tc. Assuming that only heat conduction takes place, TCT is equal to

Answer»

Three rods of identical area of cross-section and made from the same metal form the sides of an isosceles triangle ABC , right angled at B. The points A and B are maintained at temperatures T and $\sqrt{2}$ T respectively. In the steady state the temperature of the point C is $T_{c}$ . Assuming that only heat conduction takes place, $\frac{T_{C}}{T}$ is equal to

Discussion

33.	. An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively
Answer» . An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively

Discussion

34.	A body moves in a circle of radius 1 m. Its speed is given by v=2t2. FInd the net acceleration at t=2 seconds.
Answer» A body moves in a circle of radius $1 m$ . Its speed is given by $v = 2 t^{2}$ . FInd the net acceleration at $t = 2$ seconds.

Discussion

35.	An LVDT with associated signal conditioning will be used to measure work-piece motion from -20cm to 20cm. The static transfer function is 2.5 (mV/mm), the output will be interfaced to a computer via an ADC. If the desired resolution is 0.5mm, the number of bits ADC must have (Take reference voltage 5V)12
Answer» An LVDT with associated signal conditioning will be used to measure work-piece motion from -20cm to 20cm. The static transfer function is 2.5 (mV/mm), the output will be interfaced to a computer via an ADC. If the desired resolution is 0.5mm, the number of bits ADC must have (Take reference voltage 5V) 12

Discussion

36.	A uniform rod of mass 2 kg is hanging from a thread attached at the midpoint (O) of the rod. A block of mass m=6 kg hangs at the left end of the rod and a block of mass M hangs at the right end at a distance of 30 cm from the mid point (O). If the system is in equilibrium, calculate the mass (M), given that overall length of the rod is 100 cm. Take g=10 m/s2.
Answer» A uniform rod of mass $2 kg$ is hanging from a thread attached at the midpoint $(O)$ of the rod. A block of mass $m = 6 kg$ hangs at the left end of the rod and a block of mass $M$ hangs at the right end at a distance of $30 cm$ from the mid point $(O)$ . If the system is in equilibrium, calculate the mass $(M)$ , given that overall length of the rod is $100 cm$ . Take $g = 10 {m/s}^{2}$ .

Discussion

37.	A small bob of mass m is suspended by a massless string from a cart of the same mass m as shown in the figure. The friction between the cart and horizontal ground is negligible. The bob is given a velocity v0 in horizontal direction as shown. The maximum height attained by the bob is(initially whole system (bob+string+cart) was at rest).
Answer» A small bob of mass $m$ is suspended by a massless string from a cart of the same mass $m$ as shown in the figure. The friction between the cart and horizontal ground is negligible. The bob is given a velocity $v_{0}$ in horizontal direction as shown. The maximum height attained by the bob is (initially whole system (bob+string+cart) was at rest).

Discussion

38.	Current in the circuit will be (in amperes):
Answer» Current in the circuit will be (in amperes):

Discussion

39.	Calculate the magnetic potential in air at a point distance 60 cm on the axis of a magnet if moment 70 amp m & length 10 cm.
Answer» Calculate the magnetic potential in air at a point distance 60 cm on the axis of a magnet if moment 70 amp m & length 10 cm.

Discussion

40.	A rod of length 1 m is rotating about the end P with an angular velocity 20 rad/s. Due to centrifugal force, the free electrons in the rod move towards the end Q and an emf is created. Find the induced emf.(melectron=9.1×10−31 kg, qelectron=1.6×10−19 C).
Answer» A rod of length $1 m$ is rotating about the end $P$ with an angular velocity $20 rad/s$ . Due to centrifugal force, the free electrons in the rod move towards the end $Q$ and an emf is created. Find the induced emf. $(m_{electron} = 9.1 \times 10^{- 31} kg, q_{electron} = 1.6 \times 10^{- 19} C)$ .

Discussion

41.	The resistance of a coil of aluminum wire at 180C is 200 ohm. The temperature of the wire is increased and the resistance rises to 240 ohm. If the temperature coefficient of resistance of aluminum is 0.0039/0Cat 180C, determine the temperature to which the coil has risen.
Answer» The resistance of a coil of aluminum wire at $18^{0} C$ is 200 ohm. The temperature of the wire is increased and the resistance rises to 240 ohm. If the temperature coefficient of resistance of aluminum is $0.0039 /^{0} C$ at $18^{0} C$ , determine the temperature to which the coil has risen.

Discussion

42.	An engine whistling at a constant frequency n0 and moving with a constant velocity goes past a stationary observer. As the engine crosses him, the frequency of the sound heard by him changes by a factor f. The actual difference in the frequencies of sound heard by him before and after the engine crosses him is
Answer» An engine whistling at a constant frequency $n_{0}$ and moving with a constant velocity goes past a stationary observer. As the engine crosses him, the frequency of the sound heard by him changes by a factor f. The actual difference in the frequencies of sound heard by him before and after the engine crosses him is

Discussion

43.	The following figure shows the velocity time plot for a particle traveling along a straight line. The distance covered by the particle from t= 0 to t = 5s is m.
Answer» The following figure shows the velocity time plot for a particle traveling along a straight line. The distance covered by the particle from t= 0 to t = 5s is m.

Discussion

44.	A circular coil of wireconsisting of 100 turns, each of radius 8.0 cm carries a current of0.40 A. What is the magnitude of the magnetic field B at thecentre of the coil?
Answer» A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

Discussion

45.	Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is
Answer» Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

Discussion

46.	A 40 kg child makes 10 revolutions in 29.3 seconds, moving on a circular path. The radius of the path taken by the child is 2.9 meters. Then, centripetal force acting on him is:
Answer» A $40 k g$ child makes $10$ revolutions in $29.3$ seconds, moving on a circular path. The radius of the path taken by the child is $2.9$ meters. Then, centripetal force acting on him is:

Discussion

47.	(i) Explain the meaning of the following equation of motion: v = u + at, where symbols have their usual meanings.(ii) A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, What is the value of acceleration?
Answer» (i) Explain the meaning of the following equation of motion: v = u + at, where symbols have their usual meanings. (ii) A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, What is the value of acceleration?

Discussion

48.	Find the minimum and maximum value of the function y =x cube - 3x square + 6 find the values of y at which it occurs
Answer» Find the minimum and maximum value of the function y =x cube - 3x square + 6 find the values of y at which it occurs

Discussion

49.	Provide a flowchart describing whole counter current mechanism with different osmolarity in different parts
Answer» Provide a flowchart describing whole counter current mechanism with different osmolarity in different parts

Discussion

50.	a cylindrical capacitor has two coaxial cylinder of length 20cm and radii 1.8cm and 1.82cm.The outer cylinder is earthed The net capaci†an ce of the system
Answer» a cylindrical capacitor has two coaxial cylinder of length 20cm and radii 1.8cm and 1.82cm.The outer cylinder is earthed The net capaci†an ce of the system

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Keeping the voltage of charging source cons†an t, what would be the percentage change in the energy stored in a parallel plate capacitor if the separation between the plates were to be increased by 10%

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h . Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h . The average speed of the man over the interval of time 0 to 40 min is equal to

A particle of mass m attached to a string of length l is describing circular motion on a smooth plane inclined at an angle α with the horizontal. For the particle to complete the loop, its velocity at the lowest point should exceed

The displacement of the particle (in m) is given by y=2t+t2−2t3 What is the velocity (in m/s) of the particle at the instant when its acceleration is zero?

what is the difference between these 4 terms:1)pressure2)partial pressure3)partial vapour pressure4)vapour pressure

For the system shown in the figure, the position of the final image of object O is[Assume origin of co-ordinate system to be at optical centre of half convex lens]

Two bodies are held separated by 9.8 m vertically one above the other. They are released simultaneously to fall freely under gravity. After 2 s the relative distance between them is

A particle of mass m and charge+q1 moves diametrically through a uniformly charged sphere of radius R with total charge -q2. If +q1 performs SHM, then its time period is?

97.A cyclotron with radius R and magnetic field B is used to accelerate charge q and mass m. If voltage between the dees is V0. Find number of revolution performed by charge before it leaves cyclotron.

a stone of mass 0.2 kg is tied to one end of a string of length 80 cm. holding the other end the stone is whiled into a vertical circle. the min speed of the stone and tension at the lowest point of circular path so that it just completes the circle ar

Absolute zero temperature is not the temperature of zero energy why?

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now becomes-

An AC voltage source described by V=10cos(π2)t is connected to a 1 μF capacitor as shown in figure. The key K is closed at t=0. The time (t&gt;0) after which the magnitude of current I reaches its maximum value for the first time is

A body cools in 7 minutes from 60∘C to 40∘C. What will be its temperature after next 7 minutes, if the temperature of the surroundings is 10∘C?

Why magnetic field is created due a current carrying conductor?

If αr and αt represent radial and tangential accelerations, the motion of a particle will be uniformly circular if

In the given figure coefficient of friction between m and M is 0.25. Everywhere else friction is zero. If M = 2m and θ=37∘, then acceleration of M is

0.48 gram of a volatile gas upon vapourisation gives 90 ml of Vapour at NTP what will be the vapour density of the substance is

In an AC circuit, the instantaneous emf and current are given by e=100sin30t,i=20sin(30t−π4). In one cycle of AC, the average power consumed by the circuit in watt and the wattless current in amperes are, respectively –

Mark the correct options looking to the given Maxwell’s distribution Curve.

29.The coefficient of performance of a refrigerator working between 10^° C and 20^° C is - A. 1 B. 28.3 C. 29.3 D. 3.53

In a series resonant LCR circuit, the voltage across resistor R is 100 V and R=1 kΩ with C=2 μF. The resonant frequency ω is 200 rad/s. At resonance, the voltage across L is

A cell develops the same power across two resistance R1 and R2 separately. The internal resistance of the cell is-

A point charge causes an electric flux of –1.0 × 103 Nm2/C to pass through a spherical Gaussian surface of 10.0 cm radius centred onthe charge. (a) If the radius of the Gaussian surface were doubled,how much flux would pass through the surface? (b) What is thevalue of the point charge?

The position of the particle is given by x=t2+5t+2 in m. The average speed of the particle in 6 sec is

Derivative of f(x)=xsin(√x) is

. An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively

A body moves in a circle of radius 1 m. Its speed is given by v=2t2. FInd the net acceleration at t=2 seconds.

Current in the circuit will be (in amperes):

Calculate the magnetic potential in air at a point distance 60 cm on the axis of a magnet if moment 70 amp m & length 10 cm.

A rod of length 1 m is rotating about the end P with an angular velocity 20 rad/s. Due to centrifugal force, the free electrons in the rod move towards the end Q and an emf is created. Find the induced emf.(melectron=9.1×10−31 kg, qelectron=1.6×10−19 C).

The resistance of a coil of aluminum wire at 180C is 200 ohm. The temperature of the wire is increased and the resistance rises to 240 ohm. If the temperature coefficient of resistance of aluminum is 0.0039/0Cat 180C, determine the temperature to which the coil has risen.

The following figure shows the velocity time plot for a particle traveling along a straight line. The distance covered by the particle from t= 0 to t = 5s is m.

A circular coil of wireconsisting of 100 turns, each of radius 8.0 cm carries a current of0.40 A. What is the magnitude of the magnetic field B at thecentre of the coil?

A 40 kg child makes 10 revolutions in 29.3 seconds, moving on a circular path. The radius of the path taken by the child is 2.9 meters. Then, centripetal force acting on him is:

(i) Explain the meaning of the following equation of motion: v = u + at, where symbols have their usual meanings.(ii) A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, What is the value of acceleration?​

Find the minimum and maximum value of the function y =x cube - 3x square + 6 find the values of y at which it occurs

Provide a flowchart describing whole counter current mechanism with different osmolarity in different parts

a cylindrical capacitor has two coaxial cylinder of length 20cm and radii 1.8cm and 1.82cm.The outer cylinder is earthed The net capaci†an ce of the system

An AC voltage source described by V=10cos(π2)t is connected to a 1 μF capacitor as shown in figure. The key K is closed at t=0. The time (t>0) after which the magnitude of current I reaches its maximum value for the first time is

(i) Explain the meaning of the following equation of motion: v = u + at, where symbols have their usual meanings.(ii) A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, What is the value of acceleration?