Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 112

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Two insulating plates are both uniformly charged in such a way that the potential difference between them is $V_{2} - V_{1} = 20 V .$ (i.e. plate $2$ is at a higher potential). The plates are separated by $d = 0.1 m$ and can be treated as infinitely large. An electron is released from rest on the inner surface of plate $1 .$ What is its speed when it hits plate $2 ?$ $(e = 1.6 \times 10^{- 19} C, m_{e} = 9.11 \times 10^{- 31} kg)$

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Important Questions on Electrostatics

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 113

A particle of mass

2 g

and charge

1 μC

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

1 m

from a fixed charge of

1 mC

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

10 m

from the fixed charge is

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 114

On moving a charge of

20

coulombs by

2 cm, 2 J

of work is done, then the potential difference between the points is

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 115

For an infinite line of charge having charge density $λ$ lying along $x$ -axis, the work required in moving charge $q$ from $C$ to $A$ along the arc $C A$ is:

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 116

A flat circular fixed disc has a charge

+ Q

uniformly distributed on the disc. A charge

+ q

is thrown with kinetic energy

K

towards the disc along its axis. The charge

q :

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 117

In

H

atom, an electron is rotating around the proton in an orbit of radius

r .

Work done by an electron in moving once around the proton along the orbit will be-

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 118

You are given an arrangement of three-point charges

q

,

2 q

and

x q

separated by equal finite distances so that the electric potential energy of the system is zero. Then the value of

x

is

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 119

If a charge

q

is placed at the centre of the line joining two equal charges

Q

such that the system is in equilibrium, then the value of

q

is,

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 120

If

' n'

identical water drops assumed spherical each charged to potential energy

U

coalesce to a single drop, the potential energy of the single drop is (Assume that drops are uniformly charged):