For a polar molecule, which of the following statements is true?

The centre of gravity of electrons and protons do not coincide

The centre of gravity of electrons and protons coincide

The charge distribution is always symmetrical

The dipole moment is always zero

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).

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IMPORTANT

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Assertion: Equipotential line is perpendicular to direction of electric field.

Reason: In equipotential surface, electric field is zero.

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Important Questions on Electrostatic Potential and Capacitance

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 42

The electric potential in a certain region of space is given by

V = - 3 x^{2} + 4 x

, where,

x

is in metres and

V

is in volts. In this region, the equipotential surfaces are,

EASY

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 43

Work done in carrying a charge

Q'

once round the circle of radius

r

with a charge

Q

at the centre is

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 45

An alpha particle of energy

5 M e V

is scattered through

180 °

by a fixed uranium nucleus. The distance of closest approach is of the order of

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 46

A particle of mass

2 g

and charge

1 μ C

is held at rest a frictionless horizontal surface at a distance of

1 m

from a fixed charge

1 mC

. If the particle is released, it will be repelled. The speed of the particle when it is at a distance of

10 m

from the fixed charge is,

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 47

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

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 48

A charged particle

q

is shot towards another charged particle

Q

which is fixed, with a speed

v

. It approaches

Q

up to the closest distance

r

and then returns. If

q

is shot with speed

2 v

, the closest distance of approach would be

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 49

A region contains a uniform electric field

\vec{E} = (10 \hat{i} + 30 \hat{j}) V m^{- 1}

. A and B are two points Intech field at (1, 2, 0) and (2, 1, 3)m respectively. The work done when a charge of 0.8C moves from A to B in a parabolic path is

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Achieve CUET (UG) Physics Practice Book>Chapter 2 - Electrostatic Potential and Capacitance>Exercise>Q 50

Statement I When two charged spheres are connected to each other by a thin conducting wire, charge flows from the bigger sphere to the smaller sphere if initial charges on them are same.

Statement II Electrostatic energy will be lost in redistribution.

Assertion: Equipotential line is perpendicular to direction of electric field. Reason: In equipotential surface, electric field is zero.

Important Questions on Electrostatic Potential and Capacitance

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Assertion: Equipotential line is perpendicular to direction of electric field.

Reason: In equipotential surface, electric field is zero.