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Question

A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its centre, for x < R , the electric field is directly proportional to


A

1x2

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B

1x

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C

x

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D

x2

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Solution

The correct option is C

x


Let sphere has uniform charge density ρ(=3Q4πR3) and E is the electric field at distance X from
the centre of the sphere.
Applying Gauss law

E.4π x2=qϵ0=ρVϵ0=ρϵ0×43πx3
(v'= Volume of dotted sphere)
E=ρ3ϵ0xEx


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