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:

Q a + b + c 4 π ϵ 0 a 2 + b 2 + c 2

Q a 2 + b 2 + c 2 4 π ϵ 0 a 3 + b 3 + c 3

Q 12 π ϵ 0 a b + b c + c a a b c

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 26

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A charged water drop of radius $0.1 μm$ is under equilibrium in some electric field. The charge on the drop is equivalent to electronic charge The intensity of electric field is $(g = 10 m s^{- 2}) -$

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Important Questions on Electrostatics

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 27

Two large sized charged plates have a charge. density of

+ σ

and

- σ .

The_resultant force on the proton located midway between them will be -

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 28

Two parallel charged plates have a charge density

+ σ

and

- σ .

The resultant force on the proton located outside the plates at some distance will be -

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 29

The charge density of an insulating infinite surface is

(\frac{e}{π}) C m^{- 2}

then the field intensity at a nearby point in volt/meter will be -

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 30

There is a uniform electric field in

X

-direction. If the work done by an external agent in moving a charge of

0.2 C

through a distance of

2 m

slowly along the line making an angle of

60 °

with

X

-direction is

4 joule

, then the magnitude of

E

is

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 31

A simple pendulum has a length $ℓ,$ mass of bob $m .$ The bob is given a charge $q$ coulomb. The pendulum is suspended to a uniform horizontal electric field of strength $E$ as shown in the figure, then calculate the time period of oscillation when the bob is slightly displaced from its mean position is:

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