50278 + Interview Questions in Physics

1.	A thin prism P1 with angle 6∘ and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 will be
Answer» A thin prism $P_{1}$ with angle $6^{\circ}$ and made from glass of refractive index $1.54$ is combined with another thin prism $P_{2}$ of refractive index $1.72$ to produce dispersion without deviation. The angle of prism $P_{2}$ will be

Discussion

2.	Trace over the waves and colour the fish.Disclaimer: Kindly refer the textbook for the image.
Answer» Trace over the waves and colour the fish. Disclaimer: Kindly refer the textbook for the image.

Discussion

3.	Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle 30∘ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is.
Answer» Two plane mirrors $A$ and $B$ are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle $30^{\circ}$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is.

Discussion

4.	An Alpha particle is accelerated from rest through a potential of V volts its final kinetic energy
Answer» An Alpha particle is accelerated from rest through a potential of V volts its final kinetic energy

Discussion

5.	A straight line source of sound of length 10 m emits pulse that travels radially outward from the source. A detector is located at a perpendicular distance of 7 m from the source. The total power emitted by the source in the form of sound wave is 2.2×104 W. If the surface area of the acoustic detector is 1.2 cm2, then the power (in mW) intercepted by the detector is(Assume waves reaches surface of detector perpendicularly and take π=227)
Answer» A straight line source of sound of length $10 m$ emits pulse that travels radially outward from the source. A detector is located at a perpendicular distance of $7 m$ from the source. The total power emitted by the source in the form of sound wave is $2.2 \times 10^{4} W$ . If the surface area of the acoustic detector is $1.2 {cm}^{2}$ , then the power (in $mW$ ) intercepted by the detector is (Assume waves reaches surface of detector perpendicularly and take $π = \frac{22}{7}$ )

Discussion

6.	86. Principle of cuolomb law
Answer» 86. Principle of cuolomb law

Discussion

7.	49. Frequency of white light
Answer» 49. Frequency of white light

Discussion

8.	48.what is latent heat of vapourization
Answer» 48.what is latent heat of vapourization

Discussion

9.	Three waves from three coherent sources meet at the same point. The Amplitude of each wave is A0. Intensity corresponding to A0 is I0. At a point, the phase difference between the first wave and the second wave is 60∘and the path difference between the first wave and the third wave is λ3. The first wave lags behind in phase angle from the second and the third wave. The resultant intensity at this point is
Answer» Three waves from three coherent sources meet at the same point. The Amplitude of each wave is $A_{0}$ . Intensity corresponding to $A_{0}$ is $I_{0}$ . At a point, the phase difference between the first wave and the second wave is $60^{\circ}$ and the path difference between the first wave and the third wave is $\frac{λ}{3}$ . The first wave lags behind in phase angle from the second and the third wave. The resultant intensity at this point is

Discussion

10.	The value of π4∫0xsin2x dx is:
Answer» The value of $\frac{π}{4} \int 0 x {sin}^{2} x d x$ is:

Discussion

11.	the mean radius of earth is R and its angular velocity is ω what will be the radius of orbit of a geostationary satelli
Answer» the mean radius of earth is R and its angular velocity is ω what will be the radius of orbit of a geostationary satelli

Discussion

12.	A body of mass m is taken from the earth's surface to the height equal to twice the radius R of the earth. The change in potential energy of the body will be -
Answer» A body of mass $m$ is taken from the earth's surface to the height equal to twice the radius $R$ of the earth. The change in potential energy of the body will be -

Discussion

13.	The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is
Answer» The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is

Discussion

14.	A pertical of mass 1 kg move in circular path which radius 1m. Kinetic energy =root S. Find out the time when angle between radial acceleration and net acceleration is 45 degree. (S=distance travel by the pertical )
Answer» A pertical of mass 1 kg move in circular path which radius 1m. Kinetic energy =root S. Find out the time when angle between radial acceleration and net acceleration is 45 degree. (S=distance travel by the pertical )

Discussion

15.	The energy of electro-magnetic radiation is 19.875×10−13 erg. What is its wave number in cm−1(h=6.625×10−27erg−s;c=3×1010cm.s−1)
Answer» The energy of electro-magnetic radiation is $19.875 \times 10^{- 13}$ erg. What is its wave number in $c m^{- 1} (h = 6.625 \times 10^{- 27} e r g - s; c = 3 \times 10^{10} c m . s^{- 1})$

Discussion

16.	A certain string (fixed at one end and free at the other end) can vibrate at several frequencies, the lowest of which is 200 Hz. What are next two higher frequencies to which it vibrates?
Answer» A certain string (fixed at one end and free at the other end) can vibrate at several frequencies, the lowest of which is $200 Hz$ . What are next two higher frequencies to which it vibrates?

Discussion

17.	30.The motion of a body falling from rest in a medium is given by equation dv/dt = 1-2v the velocity at any time t is?
Answer» 30.The motion of a body falling from rest in a medium is given by equation dv/dt = 1-2v the velocity at any time t is?

Discussion

18.	how much should the pressure be increased in order to decrease the volume of a gas by 15% at a constant temperature?
Answer» how much should the pressure be increased in order to decrease the volume of a gas by 15% at a constant temperature?

Discussion

19.	The given figure shows an inductor and a resistor fixed on a conducting wire. A movable conducting wire PQ starts moving on the fixed rails from t=0 with constant velocity 1 m/s. The work done (in Joule) by the external force on the wire PQ in 2 seconds is _______
Answer» The given figure shows an inductor and a resistor fixed on a conducting wire. A movable conducting wire $PQ$ starts moving on the fixed rails from $t = 0$ with constant velocity $1 m/s$ . The work done (in Joule) by the external force on the wire $PQ$ in $2 seconds$ is _______

Discussion

20.	As charge of particle 2 mc is at the position (1,1,1) m the electrostatic force on another chargedaeticle at 1 mc at (0,0,0) .is 500N 6000N 400N 200N
Answer» As charge of particle 2 mc is at the position (1,1,1) m the electrostatic force on another chargedaeticle at 1 mc at (0,0,0) .is 500N 6000N 400N 200N

20.

As charge of particle 2 mc is at the position (1,1,1) m the electrostatic force on another chargedaeticle at 1 mc at (0,0,0) .is 500N 6000N 400N 200N

Answer»

As charge of particle 2 mc is at the position (1,1,1) m the electrostatic force on another chargedaeticle at 1 mc at (0,0,0) .is

500N

6000N

400N

200N

Discussion

21.	A long,straight wire is fixed horizontally and carries a current of 50.0 A.A second wire having linear mass density 1.0×10−4 kg m−1 is placed parallel to and directly above this wire at separation of 5.0 mm.What current should this second wire carry such that the magnetic repulsion can balance its weight ?
Answer» A long,straight wire is fixed horizontally and carries a current of 50.0 A.A second wire having linear mass density $1.0 \times 10^{- 4} k g m^{- 1}$ is placed parallel to and directly above this wire at separation of 5.0 mm.What current should this second wire carry such that the magnetic repulsion can balance its weight ?

Discussion

22.	Two identical pendulums oscillate with a constant phase difference pi/4 and same amplitude if the maximum velocity of one is v the maximum velocity of the other will be
Answer» Two identical pendulums oscillate with a constant phase difference pi/4 and same amplitude if the maximum velocity of one is v the maximum velocity of the other will be

Discussion

23.	find thepotential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r
Answer» find thepotential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r

Discussion

24.	A cylinder of cross section area A has two pistons of negligible mass separated by distance l loaded with spring of negligible mass. An ideal gas at temperature T1 is in the cylinder when the springs are relaxed. When the gas is heated by some means, its temperature becomes T2 and the springs get compressed by l/2 each. If P0 is atmospheric pressure and spring constant k=2P0Al, then the ratio of T2 and T1 is
Answer» A cylinder of cross section area $A$ has two pistons of negligible mass separated by distance $l$ loaded with spring of negligible mass. An ideal gas at temperature $T_{1}$ is in the cylinder when the springs are relaxed. When the gas is heated by some means, its temperature becomes $T_{2}$ and the springs get compressed by $l / 2$ each. If $P_{0}$ is atmospheric pressure and spring constant $k = \frac{2 P_{0} A}{l}$ , then the ratio of $T_{2}$ and $T_{1}$ is

Discussion

25.	GSLV launched a rocket with a ejection speed of 200 m/s and with 20 m/s2 acceleration. Mass of the rocket is 2000 kg. What will be the rate of consumption of the fuel? (Take g=10 m/s2)
Answer» $G S L V$ launched a rocket with a ejection speed of $200 m/s$ and with $20 {m/s}^{2}$ acceleration. Mass of the rocket is $2000 kg$ . What will be the rate of consumption of the fuel? (Take $g = 10 {m/s}^{2}$ )

Discussion

26.	the position x of an object as function of time t is x = 2+3t where x is in m and t is in second the acceleration of an object at t = 2s will be
Answer» the position x of an object as function of time t is x = 2+3t where x is in m and t is in second the acceleration of an object at t = 2s will be

Discussion

27.	In a simple pendulum, length increases by 4% andg increases by 2%, then time period of simplependulum(1) Increases by 4%(2) Increases by 3%(3) Decreases by 3%29(4) Increases by 1%
Answer» In a simple pendulum, length increases by 4% andg increases by 2%, then time period of simplependulum(1) Increases by 4%(2) Increases by 3%(3) Decreases by 3%29(4) Increases by 1%

Discussion

28.	A shell of mass 20 kg at rest explodes into twofragments whose masses are in the ratio 2:3.The smaller fragment moves with a velocity of6 m/s The kinetic energy of the larger fragment is96 (D)(2) 216 J(3) 144 J(4) 360 J
Answer» A shell of mass 20 kg at rest explodes into twofragments whose masses are in the ratio 2:3.The smaller fragment moves with a velocity of6 m/s The kinetic energy of the larger fragment is96 (D)(2) 216 J(3) 144 J(4) 360 J

Discussion

29.	two spring of spring cons†an t k and 2k are connected in series with spring of cons†an t k with rigid surface and of 2k with a block of mass m . if block oscillate with amplitude a then point p which is in between spring oscillate with amplitude ?
Answer» two spring of spring cons†an t k and 2k are connected in series with spring of cons†an t k with rigid surface and of 2k with a block of mass m . if block oscillate with amplitude a then point p which is in between spring oscillate with amplitude ?

Discussion

30.	A person pushes a box on a rough horizontal platform surface. He applies a force of 200 N over a distance of 15 m. Thereafter, he gets progressively tired, and his applied force reduces linearly with distance to 100 N. The total distance through which the box has been moved, is 30 m. What is the work done by the person, during the total movement of the box ?
Answer» A person pushes a box on a rough horizontal platform surface. He applies a force of $200 N$ over a distance of $15 m$ . Thereafter, he gets progressively tired, and his applied force reduces linearly with distance to $100 N$ . The total distance through which the box has been moved, is $30 m$ . What is the work done by the person, during the total movement of the box ?

Discussion

31.	If a body is slipping down an inclined plane with uniform velocity then what about angular acceleration is constant or 0 ?
Answer» If a body is slipping down an inclined plane with uniform velocity then what about angular acceleration is constant or 0 ?

Discussion

32.	1)Calculate the amount of water required to saturate a vessel of volume 82 litre at 300kGiven: vapour pressure of water is 38 torr2) if same vessel under same condition was initially evacuated and 5g of water was added, what percentage of water converts into vapour
Answer» 1)Calculate the amount of water required to saturate a vessel of volume 82 litre at 300k Given: vapour pressure of water is 38 torr 2) if same vessel under same condition was initially evacuated and 5g of water was added, what percentage of water converts into vapour

Discussion

33.	A person of height √2 m is standing on horizontal floor infront of a plane mirror inclined at an angle of 45∘ with vertical. Minimum size of mirror required in meters, if person wants to see his full image is ? Eye of man is at 2 m from mirror (Write upto two digits after the decimal point.)
Answer» A person of height $\sqrt{2}$ m is standing on horizontal floor infront of a plane mirror inclined at an angle of $45^{\circ}$ with vertical. Minimum size of mirror required in meters, if person wants to see his full image is ? Eye of man is at 2 m from mirror (Write upto two digits after the decimal point.)

Discussion

34.	Find the minimum horizontal force (F) needed to start the slipping at any part of the system. (Take g=10 m/s2)
Answer» Find the minimum horizontal force $(F)$ needed to start the slipping at any part of the system. (Take $g = 10 m / s^{2}$ )

Discussion

35.	An electric heater is connected to 120 V supply. A current of 6 A flows through the heater. How much is the resistance across the heater? How much current would flow if the same heater is connected to 220 V supply?
Answer» An electric heater is connected to $120 V$ supply. A current of $6 A$ flows through the heater. How much is the resistance across the heater? How much current would flow if the same heater is connected to $220 V$ supply?

Discussion

36.	4. A car moving along a straight road at a speed ofu m/s applies brakes at t = 0 second. The ratioTrof distances travelled by the car during 3rd and8th second is 15:: 13. The car covers a distanceof 0.25 m in the last second of its travel. Thereforethe acceleration a(in m/s2) and the speed u(in m/s) of the car are respectively \lbrack NSEP 2016\rbrack(1) -0.1, 16(2) -0.2, 12(3) -0.5, 20(4) -0.1, 16
Answer» 4. A car moving along a straight road at a speed ofu m/s applies brakes at t = 0 second. The ratioTrof distances travelled by the car during 3rd and8th second is 15:: 13. The car covers a distanceof 0.25 m in the last second of its travel. Thereforethe acceleration a(in m/s2) and the speed u(in m/s) of the car are respectively \lbrack NSEP 2016\rbrack(1) -0.1, 16(2) -0.2, 12(3) -0.5, 20(4) -0.1, 16

Discussion

37.	A man of mass 40 kg is standing on a platform of 12 kg. If the man starts running at 6 m/s relative to the platform, the velocity of the platform relative to the ground is
Answer» A man of mass $40 kg$ is standing on a platform of $12 kg$ . If the man starts running at $6 m/s$ relative to the platform, the velocity of the platform relative to the ground is

Discussion

38.	Find the maximum energy stored in the spring shown in the figure, for which the block remains stationary on the rough horizontal surface.
Answer» Find the maximum energy stored in the spring shown in the figure, for which the block remains stationary on the rough horizontal surface.

Discussion

39.	a bomb is dropped from an aeroplane moving horizontally at cons†an t speed .if air resis†an ce is taken into consideration then the bomb A)falls on earth exactly below the aeroplane B)falls on earth behind the aeroplane C)falls on earth ahead of the aeroplane D)flies with the aeroplane explain with a suitable reason.
Answer» a bomb is dropped from an aeroplane moving horizontally at cons†an t speed .if air resis†an ce is taken into consideration then the bomb A)falls on earth exactly below the aeroplane B)falls on earth behind the aeroplane C)falls on earth ahead of the aeroplane D)flies with the aeroplane explain with a suitable reason.

Discussion

40.	The efficiency of a cell when connected to aresistance R is 60%. What will be its efficiencyif the external resistance is increased to six times(I) 90%(2) 60%(3) 80%(4) 10%
Answer» The efficiency of a cell when connected to aresistance R is 60%. What will be its efficiencyif the external resistance is increased to six times(I) 90%(2) 60%(3) 80%(4) 10%

Discussion

41.	A nucleus disintegrates into 2 nuclear parts which have their velocities in the ratio 2:1. what is the ratio of their nuclear sizes?
Answer» A nucleus disintegrates into 2 nuclear parts which have their velocities in the ratio 2:1. what is the ratio of their nuclear sizes?

Discussion

42.	A rigid massless rod of length 3l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figure). When released from initial horizontal position, its instantaneous angular acceleration will be:
Answer» A rigid massless rod of length $3 l$ has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figure). When released from initial horizontal position, its instantaneous angular acceleration will be:

Discussion

43.	In the circuit shown in figure, AC source gives a voltage V=20cos2000t. Neglecting source resistance, ammeter readings will be
Answer» In the circuit shown in figure, $A C$ source gives a voltage $V = 20 cos 2000 t$ . Neglecting source resistance, ammeter readings will be

Discussion

44.	A tube open at only one end is cut into two tubes of non-equal lengths. The piece open at both the ends has a fundamental frequency of 450 Hz and the other piece has a fundamental frequency of 675 Hz. What is the first overtone frequency of the original tube?
Answer» A tube open at only one end is cut into two tubes of non-equal lengths. The piece open at both the ends has a fundamental frequency of $450 Hz$ and the other piece has a fundamental frequency of $675 Hz$ . What is the first overtone frequency of the original tube?

Discussion

45.	The mean radius of earth is R, its angular speed on its own axis is ω and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite in terms of R, ω and ?
Answer» The mean radius of earth is R, its angular speed on its own axis is ω and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite in terms of R, ω and ?

Discussion

46.	A wave given by equation y=8sin2π(0.1x−2t) where x and y are in centimeters and t is in seconds. At any instant , the phase difference between two particles, separated by 2.0 cm along the x-direction, is,
Answer» A wave given by equation $y = 8 sin 2 π (0.1 x - 2 t)$ where $x$ and $y$ are in centimeters and $t$ is in seconds. At any instant , the phase difference between two particles, separated by $2.0 cm$ along the $x$ -direction, is,

Discussion

47.	Which of the following devices convert electrical energy into mechanical energy?
Answer» Which of the following devices convert electrical energy into mechanical energy?

Discussion

48.	If the dimension of liquid drop and bubble of same liquid solution is same, then find the ratio of excess pressure inside liquid drop to the excess pressure inside bubble?
Answer» If the dimension of liquid drop and bubble of same liquid solution is same, then find the ratio of excess pressure inside liquid drop to the excess pressure inside bubble?

Discussion

49.	If 2cos 3θ=1 then θ=?(a) 10°(b) 15°(c) 20°(d) 30°
Answer» If $2 \cos 3 θ = 1 then θ = ?$ (a) 10° (b) 15° (c) 20° (d) 30°

Discussion

50.	Prove that charge situated outside the closed surface make no contribution to total electric flux over the surface
Answer» Prove that charge situated outside the closed surface make no contribution to total electric flux over the surface

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A thin prism P1 with angle 6∘ and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 will be

Trace over the waves and colour the fish.Disclaimer: Kindly refer the textbook for the image.

An Alpha particle is accelerated from rest through a potential of V volts its final kinetic energy

86. Principle of cuolomb law

49. Frequency of white light

48.what is latent heat of vapourization

The value of π4∫0xsin2x dx is:

the mean radius of earth is R and its angular velocity is ω what will be the radius of orbit of a geostationary satelli

A body of mass m is taken from the earth's surface to the height equal to twice the radius R of the earth. The change in potential energy of the body will be -

The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is

A pertical of mass 1 kg move in circular path which radius 1m. Kinetic energy =root S. Find out the time when angle between radial acceleration and net acceleration is 45 degree. (S=distance travel by the pertical )

The energy of electro-magnetic radiation is 19.875×10−13 erg. What is its wave number in cm−1(h=6.625×10−27erg−s;c=3×1010cm.s−1)

A certain string (fixed at one end and free at the other end) can vibrate at several frequencies, the lowest of which is 200 Hz. What are next two higher frequencies to which it vibrates?

30.The motion of a body falling from rest in a medium is given by equation dv/dt = 1-2v the velocity at any time t is?

how much should the pressure be increased in order to decrease the volume of a gas by 15% at a constant temperature?

The given figure shows an inductor and a resistor fixed on a conducting wire. A movable conducting wire PQ starts moving on the fixed rails from t=0 with constant velocity 1 m/s. The work done (in Joule) by the external force on the wire PQ in 2 seconds is _______

As charge of particle 2 mc is at the position (1,1,1) m the electrostatic force on another chargedaeticle at 1 mc at (0,0,0) .is 500N 6000N 400N 200N

Two identical pendulums oscillate with a constant phase difference pi/4 and same amplitude if the maximum velocity of one is v the maximum velocity of the other will be

find thepotential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r

GSLV launched a rocket with a ejection speed of 200 m/s and with 20 m/s2 acceleration. Mass of the rocket is 2000 kg. What will be the rate of consumption of the fuel? (Take g=10 m/s2)

the position x of an object as function of time t is x = 2+3t where x is in m and t is in second the acceleration of an object at t = 2s will be

In a simple pendulum, length increases by 4% andg increases by 2%, then time period of simplependulum(1) Increases by 4%(2) Increases by 3%(3) Decreases by 3%29(4) Increases by 1%

A shell of mass 20 kg at rest explodes into twofragments whose masses are in the ratio 2:3.The smaller fragment moves with a velocity of6 m/s The kinetic energy of the larger fragment is96 (D)(2) 216 J(3) 144 J(4) 360 J

two spring of spring cons†an t k and 2k are connected in series with spring of cons†an t k with rigid surface and of 2k with a block of mass m . if block oscillate with amplitude a then point p which is in between spring oscillate with amplitude ?

If a body is slipping down an inclined plane with uniform velocity then what about angular acceleration is constant or 0 ?

1)Calculate the amount of water required to saturate a vessel of volume 82 litre at 300kGiven: vapour pressure of water is 38 torr2) if same vessel under same condition was initially evacuated and 5g of water was added, what percentage of water converts into vapour

A person of height √2 m is standing on horizontal floor infront of a plane mirror inclined at an angle of 45∘ with vertical. Minimum size of mirror required in meters, if person wants to see his full image is ? Eye of man is at 2 m from mirror (Write upto two digits after the decimal point.)

Find the minimum horizontal force (F) needed to start the slipping at any part of the system. (Take g=10 m/s2)

An electric heater is connected to 120 V supply. A current of 6 A flows through the heater. How much is the resistance across the heater? How much current would flow if the same heater is connected to 220 V supply?

A man of mass 40 kg is standing on a platform of 12 kg. If the man starts running at 6 m/s relative to the platform, the velocity of the platform relative to the ground is

Find the maximum energy stored in the spring shown in the figure, for which the block remains stationary on the rough horizontal surface.

The efficiency of a cell when connected to aresistance R is 60%. What will be its efficiencyif the external resistance is increased to six times(I) 90%(2) 60%(3) 80%(4) 10%

A nucleus disintegrates into 2 nuclear parts which have their velocities in the ratio 2:1. what is the ratio of their nuclear sizes?

A rigid massless rod of length 3l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figure). When released from initial horizontal position, its instantaneous angular acceleration will be:

In the circuit shown in figure, AC source gives a voltage V=20cos2000t. Neglecting source resistance, ammeter readings will be

A tube open at only one end is cut into two tubes of non-equal lengths. The piece open at both the ends has a fundamental frequency of 450 Hz and the other piece has a fundamental frequency of 675 Hz. What is the first overtone frequency of the original tube?

The mean radius of earth is R, its angular speed on its own axis is ω and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite in terms of R, ω and ?

A wave given by equation y=8sin2π(0.1x−2t) where x and y are in centimeters and t is in seconds. At any instant , the phase difference between two particles, separated by 2.0 cm along the x-direction, is,

Which of the following devices convert electrical energy into mechanical energy?

If the dimension of liquid drop and bubble of same liquid solution is same, then find the ratio of excess pressure inside liquid drop to the excess pressure inside bubble?

If 2cos 3θ=1 then θ=?(a) 10°(b) 15°(c) 20°(d) 30°

Prove that charge situated outside the closed surface make no contribution to total electric flux over the surface