50278 + Interview Questions in Physics

1.	A square of side 2 m has one of its corners fixed at the origin as shown in the figure. If the surface density of the square varies with distance x from one side to another as σ=5x kg/m2, find the x coordinate of the position of the centre of mass of the square.
Answer» A square of side $2 m$ has one of its corners fixed at the origin as shown in the figure. If the surface density of the square varies with distance $x$ from one side to another as $σ = 5 x {kg/m}^{2}$ , find the $x$ coordinate of the position of the centre of mass of the square.

Discussion

2.	Temperature of 2 moles of a monoatomic gas is raised from 250 K to 300 K at a constant pressure. Heat absorbed by the system is close to (give your answer in kJ)
Answer» Temperature of $2 moles$ of a monoatomic gas is raised from $250 K$ to $300 K$ at a constant pressure. Heat absorbed by the system is close to (give your answer in $kJ$ )

Discussion

3.	Two glass bulbs A and B are connected by very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty and has a volume of 150 ml. On opening the stop cock, the pressure of the gas in bulb A will fall down to___.
Answer» Two glass bulbs A and B are connected by very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty and has a volume of 150 ml. On opening the stop cock, the pressure of the gas in bulb A will fall down to___.

Discussion

4.	A boy recalls the relation almost correctly but forgets where to put the constant c i.e. speed of light. He writes m=m0√1−v2, where m and m0 stand for masses and v for speed. Right place of c is
Answer» A boy recalls the relation almost correctly but forgets where to put the constant $c$ i.e. speed of light. He writes $m = \frac{m_{0}}{\sqrt{1 - v^{2}}}$ , where $m$ and $m_{0}$ stand for masses and $v$ for speed. Right place of $c$ is

Discussion

5.	Two semicircular rings of linear mass densities λ and 2λ and of radius 3π cm each, are joined together to form a complete ring as shown in the figure given below. Then, distance of the center of the mass of the complete ring from its centre will be:
Answer» Two semicircular rings of linear mass densities $λ$ and $2 λ$ and of radius $3 π cm$ each, are joined together to form a complete ring as shown in the figure given below. Then, distance of the center of the mass of the complete ring from its centre will be:

Discussion

6.	A cyclic process ABCDA is shown in a P-T diagram. The corresponding P-V diagram is
Answer» A cyclic process ABCDA is shown in a P-T diagram. The corresponding P-V diagram is

6.

A cyclic process ABCDA is shown in a P-T diagram. The corresponding P-V diagram is

Answer»

A cyclic process ABCDA is shown in a P-T diagram. The corresponding P-V diagram is

Discussion

7.	"The accelerated motion of charge Q1 produces electromagnetic waves which then propagate with the speed c, reach Q2 ,and cause a force on Q2." Explain.
Answer» "The accelerated motion of charge Q1 produces electromagnetic waves which then propagate with the speed c, reach Q2 ,and cause a force on Q2." Explain.

Discussion

8.	The equation of state of a gas is given by P(V−b)=nRT. If 1 mole of a gas is isothermally expanded from volume V and 2V, the work done during the process is
Answer» The equation of state of a gas is given by $P (V - b) = n R T$ . If $1 mole$ of a gas is isothermally expanded from volume $V$ and $2 V$ , the work done during the process is

Discussion

9.	A man of mass m1 is standing on a platform of masses m2 kept on a smooth on a horizontal surface . If the man starts moving on the platform with a velocity v relative to the platform, then recoil velocity of platform is
Answer» A man of mass m1 is standing on a platform of masses m2 kept on a smooth on a horizontal surface . If the man starts moving on the platform with a velocity v relative to the platform, then recoil velocity of platform is

Discussion

10.	Select the option with correct matching of structure with its location and function:
Answer» Select the option with correct matching of structure with its location and function:

Discussion

11.	What will happen if an ammeter is connected parallel in a circuit?g give reason?
Answer» What will happen if an ammeter is connected parallel in a circuit?g give reason?

Discussion

12.	Which among the following has an incorrect formula?
Answer» Which among the following has an incorrect formula?

Discussion

13.	Force produces an acceleration of 16 metre per second square in a body of mass 0.5 kg and an acceleration of 4 metre per second square in another body. if the bodies are fastened together then how much acceleration will be produced by this force
Answer» Force produces an acceleration of 16 metre per second square in a body of mass 0.5 kg and an acceleration of 4 metre per second square in another body. if the bodies are fastened together then how much acceleration will be produced by this force

Discussion

14.	List 2-3 differences between centre of mass and centre of gravity.
Answer» List 2-3 differences between centre of mass and centre of gravity.

Discussion

15.	Given the speed-time graph of a golf ball struck from ground at t = 0. What will be the time of flight?
Answer» Given the speed-time graph of a golf ball struck from ground at t = 0. What will be the time of flight?

15.

Given the speed-time graph of a golf ball struck from ground at t = 0. What will be the time of flight?

Answer»

Given the speed-time graph of a golf ball struck from ground at t = 0.
What will be the time of flight?

Discussion

16.	A steady current flows in a metallic conductor of non uniform cross section .Explain which of these quantities is constant along the conductor and why? :current, current density, electric field and drift speed?
Answer» A steady current flows in a metallic conductor of non uniform cross section .Explain which of these quantities is constant along the conductor and why? :current, current density, electric field and drift speed?

Discussion

17.	A particle executes a SHM with frequency ν. The frequency of variation of potential energy will be :
Answer» A particle executes a SHM with frequency $ν$ . The frequency of variation of potential energy will be :

Discussion

18.	What is the reactance of a capacitor connected to a constant DC source?
Answer» What is the reactance of a capacitor connected to a constant DC source?

Discussion

19.	Electric current is sent through a resistance of 20 ohm from a battery of EMF 2 volt and of negligible internal resistance . During measurement of current with the help of ammeter ,20% error is incurred .What is the resistance of the ammeter ?
Answer» Electric current is sent through a resistance of 20 ohm from a battery of EMF 2 volt and of negligible internal resistance . During measurement of current with the help of ammeter ,20% error is incurred .What is the resistance of the ammeter ?

Discussion

20.	State true or false::(give reasons) Four dogs are running along a line in the same direction,such that each is running relative to the dog in front of him with equal speed. Then the rate of separation between third and first dog is same as that of the fourth and the second dog.(where first , second, third are taken in order)
Answer» State true or false::(give reasons) Four dogs are running along a line in the same direction,such that each is running relative to the dog in front of him with equal speed. Then the rate of separation between third and first dog is same as that of the fourth and the second dog.(where first , second, third are taken in order)

20.

State true or false::(give reasons) Four dogs are running along a line in the same direction,such that each is running relative to the dog in front of him with equal speed. Then the rate of separation between third and first dog is same as that of the fourth and the second dog.(where first , second, third are taken in order)

Answer»

State true or false::(give reasons)

Four dogs are running along a line in the same direction,such that each is running relative to the dog in front of him with equal speed. Then the rate of separation between third and first dog is same as that of the fourth and the second dog.(where first , second, third are taken in order)

Discussion

21.	0.014 kg of nitrogen is enclosed in a vessel at a temperature of 27∘C. The amount of heat energy to be supplied to the gas to double the rms speed of its molecules is approximately equal to
Answer» $0.014 k g$ of nitrogen is enclosed in a vessel at a temperature of $27^{\circ} C$ . The amount of heat energy to be supplied to the gas to double the rms speed of its molecules is approximately equal to

Discussion

22.	I am writing a definition of potential energy, please check the correctness of this definition !!!! this is the energy possessed by a body by virtue of its position in a vector field such as gravitational field and electric field .
Answer» I am writing a definition of potential energy, please check the correctness of this definition !!!! this is the energy possessed by a body by virtue of its position in a vector field such as gravitational field and electric field .

22.

I am writing a definition of potential energy, please check the correctness of this definition !!!! this is the energy possessed by a body by virtue of its position in a vector field such as gravitational field and electric field .

Answer»

I am writing a definition of potential energy, please check the correctness of this definition !!!!

this is the energy possessed by a body by virtue of its position in a vector field such as gravitational field and electric field .

Discussion

23.	Explain Why magnetic field outside the solenoid is zero?
Answer» Explain Why magnetic field outside the solenoid is zero?

Discussion

24.	How can speed be written as time / length when it should have been distance / time
Answer» How can speed be written as time / length when it should have been distance / time

Discussion

25.	A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7th second is
Answer» A body covers $200 c m$ in the first $2$ seconds and $220 c m$ in the next $4$ seconds. The velocity of the body at the end of the $7^{t h}$ second is

Discussion

26.	The value of [1(216)−13+1(256)−14+1(32)−25]
Answer» The value of $[\frac{1}{{(216)}^{- \frac{1}{3}}} + \frac{1}{{(256)}^{- \frac{1}{4}}} + \frac{1}{{(32)}^{- \frac{2}{5}}}]$

Discussion

27.	What is the momentum of a photon having frequency 1.5×1013Hz
Answer» What is the momentum of a photon having frequency $1.5 \times 10^{13} H z$

Discussion

28.	What happens if a vector is multiplied by the number 2?
Answer» What happens if a vector is multiplied by the number 2?

Discussion

29.	Figures 10.23 (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect? Why?
Answer» Figures 10.23 (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect? Why?

Discussion

30.	A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425cm2 . What maximum pressure would the smaller piston have to bear?
Answer» A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is $425 c m^{2}$ . What maximum pressure would the smaller piston have to bear?

Discussion

31.	In HCl molecule, the separation between the nuclei of hydrogen and chlorine atoms is 1.27 ∘A. If the mass of a chlorine atom is 35.5 times that of a hydrogen atom, the centre of mass of the HCl molecule is at a distance of
Answer» In HCl molecule, the separation between the nuclei of hydrogen and chlorine atoms is $1.27 \circ A$ . If the mass of a chlorine atom is 35.5 times that of a hydrogen atom, the centre of mass of the HCl molecule is at a distance of

Discussion

32.	Water is flowing through two horizontal pipes of different diameters which are connected together. The diameter of the two pipes are 3 cm and 6 cm respectively. If the speed of water in the narrower tube is 4 m/s, then the speed of water in the wider tube is
Answer» Water is flowing through two horizontal pipes of different diameters which are connected together. The diameter of the two pipes are $3 cm$ and $6 cm$ respectively. If the speed of water in the narrower tube is $4 m/s$ , then the speed of water in the wider tube is

Discussion

33.	The mass and diameter of a planet are two times those of earth. If a second's pendulum is taken to it, the time period of the pendulum in second is:
Answer» The mass and diameter of a planet are two times those of earth. If a second's pendulum is taken to it, the time period of the pendulum in second is:

Discussion

34.	The prong of an electrically operated tuning fork is connected to a long string of μ=1kg/m and tension 25 N. The maximum velocity of the prong is 1 cm/s, then the average power needed to drive the prong is:
Answer» The prong of an electrically operated tuning fork is connected to a long string of $μ = 1 k g / m$ and tension 25 N. The maximum velocity of the prong is 1 cm/s, then the average power needed to drive the prong is:

Discussion

35.	Two simple harmonic motions are represented by equations y1=4sin(10t+ϕ) and y2=5cos(10t). What is the phase difference between their velocities?
Answer» Two simple harmonic motions are represented by equations $y_{1} = 4 sin (10 t + ϕ)$ and $y_{2} = 5 cos (10 t)$ . What is the phase difference between their velocities?

Discussion

36.	A piece of wood of mass 0.03kg is dropped from the top of a 100 m height building. At the same time, a bullet of mass 0.02kg is fired vertically upward with a velocity 100ms−1 from the ground. The bullet after collision gets embedded in the wood. Then, the maximum height to which the combined system reaches above the top of the building before falling below is Take, g=10ms−2)
Answer» A piece of wood of mass $0.03 kg$ is dropped from the top of a 100 m height building. At the same time, a bullet of mass $0.02 kg$ is fired vertically upward with a velocity $100 {ms}^{- 1}$ from the ground. The bullet after collision gets embedded in the wood. Then, the maximum height to which the combined system reaches above the top of the building before falling below is $Take, g = 10 m s^{- 2})$

Discussion

37.	One has to throw a particle from one side of a fixed sphere, in diametrical plane to another side such that it just grazes the sphere. Minimum possible speed for this is √2gR(√α+√β). Then α+β is. Write upto two digits after the decimal point.
Answer» One has to throw a particle from one side of a fixed sphere, in diametrical plane to another side such that it just grazes the sphere. Minimum possible speed for this is $\sqrt{2 g R (\sqrt{α} + \sqrt{β})} .$ Then $α + β$ is. Write upto two digits after the decimal point.

Discussion

38.	The system containing the rails and the wire of the previous problem is kept vertically in a uniform horizontal magnetic field B that is perpendicular to the plane of the rails (figure 38-E21). It is found that the wire stays in equilibrium. If the wire ab is replaced by another wire of double its mass, how long will it take in falling through a distance equal to its length?
Answer» The system containing the rails and the wire of the previous problem is kept vertically in a uniform horizontal magnetic field B that is perpendicular to the plane of the rails (figure 38-E21). It is found that the wire stays in equilibrium. If the wire ab is replaced by another wire of double its mass, how long will it take in falling through a distance equal to its length?

38.

The system containing the rails and the wire of the previous problem is kept vertically in a uniform horizontal magnetic field B that is perpendicular to the plane of the rails (figure 38-E21). It is found that the wire stays in equilibrium. If the wire ab is replaced by another wire of double its mass, how long will it take in falling through a distance equal to its length?

Answer»

The system containing the rails and the wire of the previous problem is kept vertically in a uniform horizontal magnetic field B that is perpendicular to the plane of the rails (figure 38-E21). It is found that the wire stays in equilibrium. If the wire ab is replaced by

another wire of double its mass, how long will it take in falling through a distance equal to its length?

Discussion

39.	When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)
Answer» When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)

Discussion

40.	Figure (31-E26) shows two identical parallel plate capacitors connected to a battery through a switch S. Initially, the switch is closed so that the capacitors are completely charged. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric constant 3. Find the ratio of the initial total energy stored in the capacitors to the final total energy stored.
Answer» Figure (31-E26) shows two identical parallel plate capacitors connected to a battery through a switch S. Initially, the switch is closed so that the capacitors are completely charged. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric constant 3. Find the ratio of the initial total energy stored in the capacitors to the final total energy stored.

Discussion

41.	kinetic energy of a body varies as time t elapsed the force acting varies as (I HAVE NOT TAKEN MATH SO PLEASE EXEXPLA IN A SUITABLE MANNER)
Answer» kinetic energy of a body varies as time t elapsed the force acting varies as (I HAVE NOT TAKEN MATH SO PLEASE EXEXPLA IN A SUITABLE MANNER)

41.

kinetic energy of a body varies as time t elapsed the force acting varies as (I HAVE NOT TAKEN MATH SO PLEASE EXEXPLA IN A SUITABLE MANNER)

Answer»

kinetic energy of a body varies as time t elapsed the force acting varies as

(I HAVE NOT TAKEN MATH SO PLEASE EXEXPLA IN A SUITABLE MANNER)

Discussion

42.	The maximum value of mass of block C so that neither A nor B moves is (Given that mass of A is 100 kg and that of B is 140 kg. Pulleys are smooth and friction coefficient between A and B and between B and horizontal surface is :(μ=0.3,g=10 m/s2).
Answer» The maximum value of mass of block $C$ so that neither $A$ nor $B$ moves is (Given that mass of $A$ is $100 k g$ and that of $B$ is $140 k g$ . Pulleys are smooth and friction coefficient between $A$ and $B$ and between $B$ and horizontal surface is :( $μ = 0.3, g = 10 m / s^{2}$ ).

Discussion

43.	Determine the quantity of pure gold in 50 grams of an alloy of pure gold and copper density of gold Copper and alloy are 19 gram centimetre cube 9 gram centimetre cube and 16 gram centimetre cube respectively
Answer» Determine the quantity of pure gold in 50 grams of an alloy of pure gold and copper density of gold Copper and alloy are 19 gram centimetre cube 9 gram centimetre cube and 16 gram centimetre cube respectively

Discussion

44.	Two equal point charges are fixed at x = -a and x = +a on the x-axis. Another point charge Q is placed at the origin. The Change in the electrical potential energy of Q, when it is displaced by a small distance x along the x-axis, is approximately proportional to
Answer» Two equal point charges are fixed at x = -a and x = +a on the x-axis. Another point charge Q is placed at the origin. The Change in the electrical potential energy of Q, when it is displaced by a small distance x along the x-axis, is approximately proportional to

Discussion

45.	Why potentiometer is better than a voltmeter give any five correct differences???
Answer» Why potentiometer is better than a voltmeter give any five correct differences???

Discussion

46.	What is the meaning of quantisation of electric charge?
Answer» What is the meaning of quantisation of electric charge?

Discussion

47.	In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move
Answer» In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move

47.

In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move

Answer»

In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move

Discussion

48.	A ball is thrown upwards at an angle of 60∘ to the horizontal. It falls on the ground at a distance of 90 m. If the ball is thrown with the same initial velocity at an angle 30∘, it will fall on the ground at a distance of
Answer» A ball is thrown upwards at an angle of $60^{\circ}$ to the horizontal. It falls on the ground at a distance of 90 m. If the ball is thrown with the same initial velocity at an angle $30^{\circ}$ , it will fall on the ground at a distance of

Discussion

49.	A car moving on a straight road covers first 1000 s of its journey with speed of 18 km/h and next 2000 s of its journey with speed of 36 km/h. Average speed of the car during whole journey is
Answer» A car moving on a straight road covers first $1000 s$ of its journey with speed of $18 km/h$ and next $2000 s$ of its journey with speed of $36 km/h$ . Average speed of the car during whole journey is

Discussion

50.	Why is voltmeter connected in parallel and an ammeter im series?
Answer» Why is voltmeter connected in parallel and an ammeter im series?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A square of side 2 m has one of its corners fixed at the origin as shown in the figure. If the surface density of the square varies with distance x from one side to another as σ=5x kg/m2, find the x coordinate of the position of the centre of mass of the square.

Temperature of 2 moles of a monoatomic gas is raised from 250 K to 300 K at a constant pressure. Heat absorbed by the system is close to (give your answer in kJ)

Two glass bulbs A and B are connected by very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty and has a volume of 150 ml. On opening the stop cock, the pressure of the gas in bulb A will fall down to___.

A boy recalls the relation almost correctly but forgets where to put the constant c i.e. speed of light. He writes m=m0√1−v2, where m and m0 stand for masses and v for speed. Right place of c is

Two semicircular rings of linear mass densities λ and 2λ and of radius 3π cm each, are joined together to form a complete ring as shown in the figure given below. Then, distance of the center of the mass of the complete ring from its centre will be:

A cyclic process ABCDA is shown in a P-T diagram. The corresponding P-V diagram is

"The accelerated motion of charge Q1 produces electromagnetic waves which then propagate with the speed c, reach Q2 ,and cause a force on Q2." Explain.

The equation of state of a gas is given by P(V−b)=nRT. If 1 mole of a gas is isothermally expanded from volume V and 2V, the work done during the process is

A man of mass m1 is standing on a platform of masses m2 kept on a smooth on a horizontal surface . If the man starts moving on the platform with a velocity v relative to the platform, then recoil velocity of platform is

Select the option with correct matching of structure with its location and function:

What will happen if an ammeter is connected parallel in a circuit?g give reason?

Which among the following has an incorrect formula?

Force produces an acceleration of 16 metre per second square in a body of mass 0.5 kg and an acceleration of 4 metre per second square in another body. if the bodies are fastened together then how much acceleration will be produced by this force

List 2-3 differences between centre of mass and centre of gravity.

Given the speed-time graph of a golf ball struck from ground at t = 0. What will be the time of flight?

A steady current flows in a metallic conductor of non uniform cross section .Explain which of these quantities is constant along the conductor and why? :current, current density, electric field and drift speed?

A particle executes a SHM with frequency ν. The frequency of variation of potential energy will be :

What is the reactance of a capacitor connected to a constant DC source?

Electric current is sent through a resistance of 20 ohm from a battery of EMF 2 volt and of negligible internal resistance . During measurement of current with the help of ammeter ,20% error is incurred .What is the resistance of the ammeter ?

0.014 kg of nitrogen is enclosed in a vessel at a temperature of 27∘C. The amount of heat energy to be supplied to the gas to double the rms speed of its molecules is approximately equal to

I am writing a definition of potential energy, please check the correctness of this definition !!!! this is the energy possessed by a body by virtue of its position in a vector field such as gravitational field and electric field .

Explain Why magnetic field outside the solenoid is zero?

How can speed be written as time / length when it should have been distance / time

A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7th second is

The value of [1(216)−13+1(256)−14+1(32)−25]

What is the momentum of a photon having frequency 1.5×1013Hz

What happens if a vector is multiplied by the number 2?

Figures 10.23 (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect? Why?

A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425cm2 . What maximum pressure would the smaller piston have to bear?

In HCl molecule, the separation between the nuclei of hydrogen and chlorine atoms is 1.27 ∘A. If the mass of a chlorine atom is 35.5 times that of a hydrogen atom, the centre of mass of the HCl molecule is at a distance of

Water is flowing through two horizontal pipes of different diameters which are connected together. The diameter of the two pipes are 3 cm and 6 cm respectively. If the speed of water in the narrower tube is 4 m/s, then the speed of water in the wider tube is

The mass and diameter of a planet are two times those of earth. If a second's pendulum is taken to it, the time period of the pendulum in second is:

The prong of an electrically operated tuning fork is connected to a long string of μ=1kg/m and tension 25 N. The maximum velocity of the prong is 1 cm/s, then the average power needed to drive the prong is:

Two simple harmonic motions are represented by equations y1=4sin(10t+ϕ) and y2=5cos(10t). What is the phase difference between their velocities?

One has to throw a particle from one side of a fixed sphere, in diametrical plane to another side such that it just grazes the sphere. Minimum possible speed for this is √2gR(√α+√β). Then α+β is. Write upto two digits after the decimal point.

When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)

kinetic energy of a body varies as time t elapsed the force acting varies as (I HAVE NOT TAKEN MATH SO PLEASE EXEXPLA IN A SUITABLE MANNER)

The maximum value of mass of block C so that neither A nor B moves is (Given that mass of A is 100 kg and that of B is 140 kg. Pulleys are smooth and friction coefficient between A and B and between B and horizontal surface is :(μ=0.3,g=10 m/s2).

Determine the quantity of pure gold in 50 grams of an alloy of pure gold and copper density of gold Copper and alloy are 19 gram centimetre cube 9 gram centimetre cube and 16 gram centimetre cube respectively

Two equal point charges are fixed at x = -a and x = +a on the x-axis. Another point charge Q is placed at the origin. The Change in the electrical potential energy of Q, when it is displaced by a small distance x along the x-axis, is approximately proportional to

Why potentiometer is better than a voltmeter give any five correct differences???

What is the meaning of quantisation of electric charge?

In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move

A ball is thrown upwards at an angle of 60∘ to the horizontal. It falls on the ground at a distance of 90 m. If the ball is thrown with the same initial velocity at an angle 30∘, it will fall on the ground at a distance of

A car moving on a straight road covers first 1000 s of its journey with speed of 18 km/h and next 2000 s of its journey with speed of 36 km/h. Average speed of the car during whole journey is

Why is voltmeter connected in parallel and an ammeter im series?