50278 + Interview Questions in Physics

1.	Minimum work done is during which process ?
Answer» Minimum work done is during which process ?

Discussion

2.	In a piezo-electric transducer a flat frequency response within 5% is required. Find the value of minimum frequency in terms of time constant for which it can be used. If the time constant of the transducer is 1.5 ms, find the phase shift at minimum frequency.
Answer» In a piezo-electric transducer a flat frequency response within 5% is required. Find the value of minimum frequency in terms of time constant for which it can be used. If the time constant of the transducer is 1.5 ms, find the phase shift at minimum frequency.

Discussion

3.	A block of mass m is released from the top of a wedge of mass M as shown in the figure. Find the displacement of the wedge on the horizontal ground, when the block reaches the bottom of the wedge.Neglect friction everywhere.
Answer» A block of mass $m$ is released from the top of a wedge of mass $M$ as shown in the figure. Find the displacement of the wedge on the horizontal ground, when the block reaches the bottom of the wedge. Neglect friction everywhere.

Discussion

4.	A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?
Answer» A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

Discussion

5.	The four arms of a wheatstone bridge have resistances as shown in the figure. A galvanometer of 15 Ω resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 V is maintained across AC.
Answer» The four arms of a wheatstone bridge have resistances as shown in the figure. A galvanometer of $15 Ω$ resistance is connected across $B D$ . Calculate the current through the galvanometer when a potential difference of $10 V$ is maintained across $A C$ .

Discussion

6.	Two particles A and B each of mass m are separated by a distance r. Another particle C of mass M is placed at the midpoint of A and B. Find the work done in taking C to a point at a distance r from both A and B without acceleration.(G= Gravitational constant and only gravitational interaction between A, B and C is considered)
Answer» Two particles $A$ and $B$ each of mass $m$ are separated by a distance $r$ . Another particle $C$ of mass $M$ is placed at the midpoint of $A$ and $B$ . Find the work done in taking $C$ to a point at a distance $r$ from both $A$ and $B$ without acceleration. $(G =$ Gravitational constant and only gravitational interaction between $A, B$ and $C$ is considered $)$

Discussion

7.

A particle of mass 2 kg is moving on a straight line under the action of force F=(8—2x) N. The particle is released from rest at x=6 m. For the subsequent motion, match the following (all the values in the Column II are in their SI units) Column 1 Column 1 i. Equlibrium position is at x = a.π4 ii. Amplitude of SHM is b.π2 iii. Time taken to go directly from x=2 to x=4 c. 4 iv. Energy of SHM is d. 6 v. Phase constant of SHM assuming equation Asin(ωt+ϕ) e. 2

Answer»

A particle of mass 2 kg is moving on a straight line under the action of force $F = (8 — 2 x) N$ . The particle is released from rest at $x = 6 m$ . For the subsequent motion, match the following (all the values in the Column II are in their SI units)

Column 1

i. Equlibrium position is at

x

=

a.

\frac{π}{4}

ii. Amplitude of SHM is

b.

\frac{π}{2}

iii. Time taken to go directly from

x = 2

to

x = 4

c. 4

iv. Energy of SHM is

d. 6

v. Phase constant of SHM assuming equation

A sin (ω t + ϕ)

e. 2

Discussion

8.	if a+b=p and ab=p then find the value of p,where a and b are possitve integer
Answer» if a+b=p and ab=p then find the value of p,where a and b are possitve integer

Discussion

9.	A plane is flying at a height of 1000m and with velocity 100m/s when a packet is dropped. What is the velocity with which it hits the ground??
Answer» A plane is flying at a height of 1000m and with velocity 100m/s when a packet is dropped. What is the velocity with which it hits the ground??

Discussion

10.	The momentum of a photon is 3.3×10−29kg−m/sec. Its frequency will be
Answer» The momentum of a photon is $3.3 \times 10^{- 29} k g - m / s e c$ . Its frequency will be

Discussion

11.	a point charge q is held at the centre of a circle of radius r band care points on the circumference of the circle and A is point outside the circle if wAB represents work done by electric field in taking a charge qo from A and B
Answer» a point charge q is held at the centre of a circle of radius r band care points on the circumference of the circle and A is point outside the circle if wAB represents work done by electric field in taking a charge qo from A and B

Discussion

12.	Block A is kept on top of block B. Both of them have a mass of 1 kg. The co-efficient of friction between the blocks are μs=0.75 and μk=0.60. The table over which block B is kept is frictionless. A force P2 is applied in block A to the left and force P on block B to the right. The minimum value of P(in N) such that sliding occures between the two block is
Answer» Block $A$ is kept on top of block $B$ . Both of them have a mass of $1 kg$ . The co-efficient of friction between the blocks are $μ_{s} = 0.75$ and $μ_{k} = 0.60$ . The table over which block $B$ is kept is frictionless. A force $\frac{P}{2}$ is applied in block $A$ to the left and force $P$ on block $B$ to the right. The minimum value of $P (in N)$ such that sliding occures between the two block is

Discussion

13.	The standing wave in a medium is expressed as y=0.2sin(0.8x)cos(3000t) m. The seperation between any two consecutive points of minimum or maximum displacement is
Answer» The standing wave in a medium is expressed as $y = 0.2 sin (0.8 x) cos (3000 t) m$ . The seperation between any two consecutive points of minimum or maximum displacement is

Discussion

14.	A spherical ball of density ρ and radius 0.003 m is dropped into a tube containing a viscous fluid up to the 0 cm mark as shown in the figure. Viscosity of the fluid =1.2160 N.s m−2 and its density ρL=ρ2=1260 kg.m−3. Assume the ball reaches a terminal speed by the 10 cm mark. Find the time taken rounded off to the nearest integer (in sec) by the ball to traverse the distance between the 10 cm and 20 cm mark. Take g=10 ms−2
Answer» A spherical ball of density $ρ$ and radius $0.003 m$ is dropped into a tube containing a viscous fluid up to the $0 cm$ mark as shown in the figure. Viscosity of the fluid $= 1.2160 {N.s m}^{- 2}$ and its density $ρ_{L} = \frac{ρ}{2} = 1260 {kg.m}^{- 3}$ . Assume the ball reaches a terminal speed by the $10 cm$ mark. Find the time taken rounded off to the nearest integer (in $sec$ ) by the ball to traverse the distance between the $10 cm$ and $20 cm$ mark. Take $g = 10 {ms}^{- 2}$

Discussion

15.	A uniform disc of mass m and radius R is cut from the right side of the larger disc of mass M and radius 2R and kept on the left side as shown in the figure (shaded portion). Find the COM of the system w.r.t the origin O.
Answer» A uniform disc of mass $m$ and radius $R$ is cut from the right side of the larger disc of mass $M$ and radius $2 R$ and kept on the left side as shown in the figure (shaded portion). Find the $C O M$ of the system w.r.t the origin $O$ .

Discussion

16.	In the figure shown, what force ‘F′ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is 0.5.(Assume limiting case of friction and take g=10 m/s2)
Answer» In the figure shown, what force $‘ F^{'}$ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is $0.5$ . (Assume limiting case of friction and take $g = 10 {m/s}^{2}$ )

Discussion

17.	For a series LCR circuit, power factor at resonance is equal to -
Answer» For a series LCR circuit, power factor at resonance is equal to -

Discussion

18.	Two coherent light sources each of wavelength λ are separated by a distance 3λ. The total number of minima formed on line AB which runs from −∞ to +∞ is:
Answer» Two coherent light sources each of wavelength $λ$ are separated by a distance $3 λ$ . The total number of minima formed on line AB which runs from $- \infty$ to $+ \infty$ is:

Discussion

19.	33.Motional emf in straight conductor
Answer» 33.Motional emf in straight conductor

Discussion

20.	A hydrogen atom, initially in the ground state, is excited by absorbing a photon of wavelength 980 ˚A. The radius of the atom in the excited state, in terms of Bohr radius a0, will be: (hc=12500 eV ˚A)
Answer» A hydrogen atom, initially in the ground state, is excited by absorbing a photon of wavelength $980 ˚ A$ . The radius of the atom in the excited state, in terms of Bohr radius $a_{0}$ , will be: $(h c = 12500 eV ˚ A)$

Discussion

21.	Calculate the number of images formed by plane mirrors kept at an angle of 10° to each others.Solution:
Answer» Calculate the number of images formed by plane mirrors kept at an angle of 10° to each others. Solution:

Discussion

22.	a particle executing SHM with time period t and amplitude a the mean velocity of the particle averaged over quarter oscillation is
Answer» a particle executing SHM with time period t and amplitude a the mean velocity of the particle averaged over quarter oscillation is

Discussion

23.	Energy released when 1000 small water drops each of same radius 10−7 m coalesce to form one large drop (Surface tension of water is 7×10−2 N/m)
Answer» Energy released when $1000$ small water drops each of same radius $10^{- 7} m$ coalesce to form one large drop (Surface tension of water is $7 \times 10^{- 2} N/m$ )

Discussion

24.	A regular polygon of n sides is formed by bending a wire of length ′L′ which carries a current i, if the magnetic field B at the centre is μ0in2sinπntanπnNπL, then N will be______(Answer opto a maximum of two decimal points is allowed)
Answer» A regular polygon of $n$ sides is formed by bending a wire of length $^{'} L^{'}$ which carries a current $i$ , if the magnetic field $B$ at the centre is $\frac{μ_{0} i n^{2} sin \frac{π}{n} tan \frac{π}{n}}{N π L}$ , then $N$ will be______(Answer opto a maximum of two decimal points is allowed)

Discussion

25.	The work function of material (in eV), whose threshold frequency is 3.2 × 1011 Hz would be
Answer» The work function of material (in eV), whose threshold frequency is 3.2 × 1011 Hz would be

Discussion

26.

A thermodynamic cycle is comprised of four processes 1→2 , 2→3 , 3→4 and 4→1 . Heat & work interactions of these processes are given as ProcessHeat transfer (J)Work done (J) 1-2 0150 (by the gas) 2-3100 (from the gas) 0 3-4 050 (on the gas) 4-1200 (to the gas) 0 The thermal efficiency of the cycle is -

Answer»

A thermodynamic cycle is comprised of four processes $1 \to 2$ , $2 \to 3$ , $3 \to 4$ and $4 \to 1$ . Heat & work interactions of these processes are given as

Process	Heat transfer (J)	Work done (J)
1-2	0	150 (by the gas)
2-3	100 (from the gas)	0
3-4	0	50 (on the gas)
4-1	200 (to the gas)	0

The thermal efficiency of the cycle is -

Discussion

27.	&quotAlthough there is charge Delocalisation in phenol, its resonance structures have charge separation due to which the phenol molecule is less stable than phenoxide Ion" what is the meaning of charge separation in the above paragraph?
Answer» "Although there is charge Delocalisation in phenol, its resonance structures have charge separation due to which the phenol molecule is less stable than phenoxide Ion" what is the meaning of charge separation in the above paragraph?

Discussion

28.	In the arrangement shown in figure, pulleys are light and springs are ideal with equal spring constant of 100 N/m. The time period of small vertical oscillations of block of mass 1 kg is
Answer» In the arrangement shown in figure, pulleys are light and springs are ideal with equal spring constant of $100 N/m$ . The time period of small vertical oscillations of block of mass $1 kg$ is

Discussion

29.	What is the need of banking the road?
Answer» What is the need of banking the road?

Discussion

30.	Six vectors →a to →f have directions as indicated in the figure. Which of the following statements may be true?
Answer» Six vectors $\to a$ to $\to f$ have directions as indicated in the figure. Which of the following statements may be true?

Discussion

31.	In a parallel plate capacitor the potential difference of 150 V is maintained between the plates. If distance between the plates is 6 mm, what will be the electric field at points A and B?
Answer» In a parallel plate capacitor the potential difference of 150 V is maintained between the plates. If distance between the plates is 6 mm, what will be the electric field at points A and B?

Discussion

32.	Two waves, travelling in the same direction through the same region, have equal frequencies, wavelengths and amplitudes. If the amplitude of each wave is 4 mm and the phase difference between the waves is 90∘, what is the resultant amplitude ?
Answer» Two waves, travelling in the same direction through the same region, have equal frequencies, wavelengths and amplitudes. If the amplitude of each wave is 4 mm and the phase difference between the waves is $90^{\circ}$ , what is the resultant amplitude ?

Discussion

33.	A long magnetic needle of length 2L,magnetic moment M and pole strength m units is broken into two at the mid point. The magnetic moment and pole strength of each piece will be
Answer» A long magnetic needle of length 2L,magnetic moment M and pole strength m units is broken into two at the mid point. The magnetic moment and pole strength of each piece will be

Discussion

34.	One mole of a monoatomic ideal gas undergoes the process A→B in the given P−V diagram. The specific heat for this process is
Answer» One mole of a monoatomic ideal gas undergoes the process $A \to B$ in the given $P - V$ diagram. The specific heat for this process is

Discussion

35.	A long solenoid of radius 2 cm has 100 turns/cm and is surrounded by a 100 turns coil connected with galvanometer of radius 4 cm having a total resistance of 20 Ω. If current in the solenoid changes from 5 A to −5 A, find the charge that has flown through galvanometer during this time.
Answer» A long solenoid of radius $2 cm$ has $100 turns/cm$ and is surrounded by a $100$ turns coil connected with galvanometer of radius $4 cm$ having a total resistance of $20 Ω$ . If current in the solenoid changes from $5 A$ to $- 5 A$ , find the charge that has flown through galvanometer during this time.

Discussion

36.	If R and H are horizontal range and maximum height attained by a projectile than its speed of projection is
Answer» If R and H are horizontal range and maximum height attained by a projectile than its speed of projection is

Discussion

37.	41 Suppose that earth has a surface charge density 1electron/meter square . calculate earth potential and electric feild just outside earth surface .radius of Earth 6400 km
Answer» 41 Suppose that earth has a surface charge density 1electron/meter square . calculate earth potential and electric feild just outside earth surface .radius of Earth 6400 km

Discussion

38.	A hollow cylindrical shell of radius R=0.1 m has mass M=6 kg. It is filled with water having mass m=3 kg. It is placed on an inclined plane connected to a spring of spring constant k=15 N/m as shown in the figure. When it is disturbed, it performs oscillations without slipping on the inclined plane. The frequency of the resulting oscillations is [Assume that the liquid does not rotate inside the cylindrical shell]
Answer» A hollow cylindrical shell of radius $R = 0.1 m$ has mass $M = 6 kg$ . It is filled with water having mass $m = 3 kg$ . It is placed on an inclined plane connected to a spring of spring constant $k = 15 N/m$ as shown in the figure. When it is disturbed, it performs oscillations without slipping on the inclined plane. The frequency of the resulting oscillations is [Assume that the liquid does not rotate inside the cylindrical shell]

Discussion

39.	A particle of mass m connected with the help of string of length l is released from rest, when string is horizontal. Tension in string when particle is at lowest point, is
Answer» A particle of mass m connected with the help of string of length $l$ is released from rest, when string is horizontal. Tension in string when particle is at lowest point, is

Discussion

40.	The equation of a transverse wave travelling on a rope is given by y=10sin π(0.001x−2.00t) where y and x are in centimeters and t in seconds. The maximum transverse speed of a particle in the rope is about.
Answer» The equation of a transverse wave travelling on a rope is given by $y = 10 s i n π (0.001 x - 2.00 t)$ where y and x are in centimeters and t in seconds. The maximum transverse speed of a particle in the rope is about.

Discussion

41.	Consider a gravity-free hall in which a tray of mass M,carrying a cubical block of ice of mass m and edge L,is at rest in the middle (figure 9-E4).If the ice melts,by what distance does the centre of mass of "the tray plus the ice" system descend ?
Answer» Consider a gravity-free hall in which a tray of mass M,carrying a cubical block of ice of mass m and edge L,is at rest in the middle (figure 9-E4).If the ice melts,by what distance does the centre of mass of "the tray plus the ice" system descend ?

41.

Consider a gravity-free hall in which a tray of mass M,carrying a cubical block of ice of mass m and edge L,is at rest in the middle (figure 9-E4).If the ice melts,by what distance does the centre of mass of "the tray plus the ice" system descend ?

Answer»

Consider a gravity-free hall in which a tray of mass M,carrying a cubical block of ice of mass m and edge L,is at rest in the middle (figure 9-E4).If the ice melts,by what distance does the centre of mass of "the tray plus the ice" system descend ?

Discussion

42.	A wheel with a rod of length 2l attached along its diameter is rolling without slipping on a horizontal plane in a magnetic field B as shown in the figure. The velocity of the centre of the wheel is v. What is the emf developed across the ends of the rod AB ?
Answer» A wheel with a rod of length $2 l$ attached along its diameter is rolling without slipping on a horizontal plane in a magnetic field $B$ as shown in the figure. The velocity of the centre of the wheel is $v .$ What is the emf developed across the ends of the rod $AB$ ?

Discussion

43.	Find the net magnetic filed at the centre (O) of the rectangle.
Answer» Find the net magnetic filed at the centre $(O)$ of the rectangle.

Discussion

44.	sin223°+sin267°cos213°+cos277°+sin259°+cos59°sin 21°=?(a) 3(b) 2(c) 1(d) 0
Answer» $\frac{(\sin^{2} 23 ° + \sin^{2} 67 °)}{(\cos^{2} 13 ° + \cos^{2} 77 °)} + \sin^{2} 59 ° + \cos 59 ° \sin 21 ° = ?$ (a) 3 (b) 2 (c) 1 (d) 0

Discussion

45.	A coil of 100 turns and having radius 1 cm is kept co-axially within a long solenoid of 8 turns per cm with radius 5 cm. Find the mutual inductance between the coil and solenoid-
Answer» A coil of $100$ turns and having radius $1 cm$ is kept co-axially within a long solenoid of $8$ turns per $cm$ with radius $5 cm .$ Find the mutual inductance between the coil and solenoid-

Discussion

46.	$20 is charged for parking initally and an additional charge of $10 is there for every hour.The equation for total charge for x h is .
Answer» $$$ 20 is charged for parking initally and an additional charge of $$ 10$ is there for every hour. The equation for total charge for x h is .

Discussion

47.	In the figure shown two beads slide along a smooth horizontal rod. If V=kVo find the value of k if θ=30°.
Answer» In the figure shown two beads slide along a smooth horizontal rod. If $V = k V_{o}$ find the value of $k$ if $θ = 30 °$ .

Discussion

48.	60. Which of the following statements is true? A. The kinetic energy of an electron is inversely proportional to square of its momentum b .de Broglie wavelength associated when a particle is directly proportional to its mass c .de Broglie wavelength associated with a particle is directly proportional to square of its velocity D.the wavelength associated with an electron is directly proportional to square root of accelerating potential E.the kinetic energy of electron is directly proportional to accelerating potential
Answer» 60. Which of the following statements is true? A. The kinetic energy of an electron is inversely proportional to square of its momentum b .de Broglie wavelength associated when a particle is directly proportional to its mass c .de Broglie wavelength associated with a particle is directly proportional to square of its velocity D.the wavelength associated with an electron is directly proportional to square root of accelerating potential E.the kinetic energy of electron is directly proportional to accelerating potential

Discussion

49.	The initial connection of the two capacitors are shown below. The heat energy dissipated until the system achieves its steady state is
Answer» The initial connection of the two capacitors are shown below. The heat energy dissipated until the system achieves its steady state is

Discussion

50.	If →A=4^i−2^j+6^k and →B=^i−2^j−3^k, the angle which the →A−→B vector makes with x-axis is
Answer» If $\to A = 4^i - 2^j + 6^k and \to B =^i - 2^j - 3^k$ , the angle which the $\to A - \to B$ vector makes with x-axis is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Minimum work done is during which process ?

In a piezo-electric transducer a flat frequency response within 5% is required. Find the value of minimum frequency in terms of time constant for which it can be used. If the time constant of the transducer is 1.5 ms, find the phase shift at minimum frequency.

A block of mass m is released from the top of a wedge of mass M as shown in the figure. Find the displacement of the wedge on the horizontal ground, when the block reaches the bottom of the wedge.Neglect friction everywhere.

A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

The four arms of a wheatstone bridge have resistances as shown in the figure. A galvanometer of 15 Ω resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 V is maintained across AC.

if a+b=p and ab=p then find the value of p,where a and b are possitve integer

A plane is flying at a height of 1000m and with velocity 100m/s when a packet is dropped. What is the velocity with which it hits the ground??

The momentum of a photon is 3.3×10−29kg−m/sec. Its frequency will be

a point charge q is held at the centre of a circle of radius r band care points on the circumference of the circle and A is point outside the circle if wAB represents work done by electric field in taking a charge qo from A and B

The standing wave in a medium is expressed as y=0.2sin(0.8x)cos(3000t) m. The seperation between any two consecutive points of minimum or maximum displacement is

A uniform disc of mass m and radius R is cut from the right side of the larger disc of mass M and radius 2R and kept on the left side as shown in the figure (shaded portion). Find the COM of the system w.r.t the origin O.

In the figure shown, what force ‘F′ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is 0.5.(Assume limiting case of friction and take g=10 m/s2)

For a series LCR circuit, power factor at resonance is equal to -

Two coherent light sources each of wavelength λ are separated by a distance 3λ. The total number of minima formed on line AB which runs from −∞ to +∞ is:

33.Motional emf in straight conductor

A hydrogen atom, initially in the ground state, is excited by absorbing a photon of wavelength 980 ˚A. The radius of the atom in the excited state, in terms of Bohr radius a0, will be: (hc=12500 eV ˚A)

Calculate the number of images formed by plane mirrors kept at an angle of 10° to each others.Solution:

a particle executing SHM with time period t and amplitude a the mean velocity of the particle averaged over quarter oscillation is

Energy released when 1000 small water drops each of same radius 10−7 m coalesce to form one large drop (Surface tension of water is 7×10−2 N/m)

A regular polygon of n sides is formed by bending a wire of length ′L′ which carries a current i, if the magnetic field B at the centre is μ0in2sinπntanπnNπL, then N will be______(Answer opto a maximum of two decimal points is allowed)

The work function of material (in eV), whose threshold frequency is 3.2 × 1011 Hz would be

&quotAlthough there is charge Delocalisation in phenol, its resonance structures have charge separation due to which the phenol molecule is less stable than phenoxide Ion" what is the meaning of charge separation in the above paragraph?

In the arrangement shown in figure, pulleys are light and springs are ideal with equal spring constant of 100 N/m. The time period of small vertical oscillations of block of mass 1 kg is

What is the need of banking the road?

Six vectors →a to →f have directions as indicated in the figure. Which of the following statements may be true?

In a parallel plate capacitor the potential difference of 150 V is maintained between the plates. If distance between the plates is 6 mm, what will be the electric field at points A and B?

Two waves, travelling in the same direction through the same region, have equal frequencies, wavelengths and amplitudes. If the amplitude of each wave is 4 mm and the phase difference between the waves is 90∘, what is the resultant amplitude ?

A long magnetic needle of length 2L,magnetic moment M and pole strength m units is broken into two at the mid point. The magnetic moment and pole strength of each piece will be

One mole of a monoatomic ideal gas undergoes the process A→B in the given P−V diagram. The specific heat for this process is

A long solenoid of radius 2 cm has 100 turns/cm and is surrounded by a 100 turns coil connected with galvanometer of radius 4 cm having a total resistance of 20 Ω. If current in the solenoid changes from 5 A to −5 A, find the charge that has flown through galvanometer during this time.

If R and H are horizontal range and maximum height attained by a projectile than its speed of projection is

41 Suppose that earth has a surface charge density 1electron/meter square . calculate earth potential and electric feild just outside earth surface .radius of Earth 6400 km

A particle of mass m connected with the help of string of length l is released from rest, when string is horizontal. Tension in string when particle is at lowest point, is

The equation of a transverse wave travelling on a rope is given by y=10sin π(0.001x−2.00t) where y and x are in centimeters and t in seconds. The maximum transverse speed of a particle in the rope is about.

Consider a gravity-free hall in which a tray of mass M,carrying a cubical block of ice of mass m and edge L,is at rest in the middle (figure 9-E4).If the ice melts,by what distance does the centre of mass of "the tray plus the ice" system descend ?

A wheel with a rod of length 2l attached along its diameter is rolling without slipping on a horizontal plane in a magnetic field B as shown in the figure. The velocity of the centre of the wheel is v. What is the emf developed across the ends of the rod AB ?

Find the net magnetic filed at the centre (O) of the rectangle.

sin223°+sin267°cos213°+cos277°+sin259°+cos59°sin 21°=?(a) 3(b) 2(c) 1(d) 0

A coil of 100 turns and having radius 1 cm is kept co-axially within a long solenoid of 8 turns per cm with radius 5 cm. Find the mutual inductance between the coil and solenoid-

$20 is charged for parking initally and an additional charge of $10 is there for every hour.The equation for total charge for x h is .

In the figure shown two beads slide along a smooth horizontal rod. If V=kVo find the value of k if θ=30°.

The initial connection of the two capacitors are shown below. The heat energy dissipated until the system achieves its steady state is

If →A=4^i−2^j+6^k and →B=^i−2^j−3^k, the angle which the →A−→B vector makes with x-axis is