Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 15

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Shown in the figure is a shell made of a conductor. It has inner radius $a$ and outer radius $b$ , and carries charge $Q$ . At its centre a dipole $\vec{p}$ is placed as shown then:

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Important Questions on Electrostatics

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 16

Three charges are placed at the three vertices of an equilateral triangle of side $a$ as shown in the figure. The force experienced by the charge placed at the vertex $A$ in a direction normal to $B C$ is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 17

A positive point charge is released from rest at a distance

r_{0}

from a positive line charge with uniform charge density. The speed

(v)

of the point charge, as a function of instantaneous distance

r

from line charge, is proportional to
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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 18

The electric field in a region is given by

\vec{E} = (A x + B) \hat{i},

where

E

is in

N C^{- 1}

and

x

is in metres. The values of constants are

A = 20 S I

unit and

B = 10 S I

unit. If the potential at

x = 1

is

V_{1}

and that at

x = - 5

is

V_{2},

then

V_{1} - V_{2}

is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 19

Assume that an electric field

\vec{E} = 30 x^{2} \hat{i}

exists in space. Then the potential difference

V_{A} - V_{O}

, where V_O is the potential at the origin and V_A the potential at x = 2 m is :

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 20

Four point charges

- Q, - q, 2 q

and

2 Q

are placed, one at each corner of the square. The relation between

Q

and

q

for which the potential at the centre of the square is zero is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 21

A mass of

1 kg

carrying a charge of

2 C

is accelerated through a potential of

1 V

. The velocity acquired by it is:

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 22

A charge

Q

is distributed over three concentric spherical shells of radii

a, b, c (a < b < c)

such that their surface charge densities are equal to one another.

The total potential at a point at distance

r

from their common centre, where

r < a,

would be:

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 23

A system of three charges are placed as shown in the figure:
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If

D > > d,

the potential energy of the system is best given by: