The diagrams below show regions of equipotential. A positive charge is moved from A to B in each diagram.

In all the four cases the work done is the same.

Maximum work is required to move q in figure (c).

Minimum work is required to move q in figure (a).

Maximum work is required to move q in figure (b).

Two hollow conducting spheres of radii R 1 and R 2 R 1 ≫ R 2 have equal charges. The potential would be:

dependent on the material property of the sphere

A dipole is placed in an electric field as shown. In which direction will it move?

towards the right as its potential energy will decrease.

towards the left as its potential energy will increase.

toward, the left as its potential energy will decrease.

towards the right as its potential energy will increase.

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Two point charges A and B, having charges $+ Q$ and $- Q$ respectively, are placed at certain distance apart and force acting between them is $F$ . If $25 %$ charge of $A$ is transferred to $B$ , then the force between the charges becomes

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Important Questions on Electrostatics

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 6th May 2018>Q 22

The electrostatic force between the metal plates of an isolated parallel plate capacitor

C

having a charge

Q

and area

A

, is

HARD

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 6th May 2018>Q 23

An electron falls from rest through a vertical distance

h

in a uniform and vertically upward directed electric field

E

. The direction of electric filed is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance

h

. The time of fall of the electron, in comparison to the time of fall of the proton is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 6th May 2018>Q 24

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field

\vec{E}

. Due to the force

q \vec{E}

, its velocity increases from 0 to

6 m s^{- 1}

in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between

0

3

seconds are respectively

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 7th May 2017>Q 25

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 7th May 2017>Q 26

The diagrams below show regions of equipotential.

Question Image

A positive charge is moved from $A$ to $B$ in each diagram.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 7th May 2017>Q 27

Suppose the charge of a proton and an electron differ slightly. One of them is

e

, the other is

(e + Δ e)

. If the net electrostatic force and gravitational force between two hydrogen atoms placed at a distance

d

(much greater than atomic size) apart is zero, then

Δ e

is of the order of [Given mass of hydrogen

m_{h} = 1.67 \times 10^{- 27} kg

]

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 24th July 2016>Q 28

An electric dipole is placed at an angle of

30 °

with an electric field intensity

2 \times 10^{5} {N C}^{- 1}

. It experiences a torque equal to

4 N m

. The charge on the dipole, if the dipole length is

2 cm

, is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Electrostatics>NEET - 24th July 2016>Q 29

A parallel-plate capacitor of area $A$ , plate separation $d$ and capacitance $C$ is filled with four dielectric materials having dielectric constants $k_{1}$ , $k_{2}$ , $k_{3}$ and $k_{4}$ as shown in the figure below. If a single dielectric material is to be used to have the same capacitance $C$ in this capacitor, then its dielectric constant $k$ is given by

Question Image

Two point charges A and B, having charges +Q and -Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then the force between the charges becomes

Important Questions on Electrostatics

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Two point charges A and B, having charges $+ Q$ and $- Q$ respectively, are placed at certain distance apart and force acting between them is $F$ . If $25 %$ charge of $A$ is transferred to $B$ , then the force between the charges becomes