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A sphere of radius R has a volume densit...

A sphere of radius R has a volume density of charge `rho= kr`, where r is the distance from the centre of the sphere and k is constant. The magnitude of the electric field which exists at the surface of the sphere is given by (`epsi_(0)` = permittivity of free space)

A

`(4pi kR^(4))/(3 epsi_(0))`

B

`(kR)/(3 epsi_(0))`

C

`(4pi kR)/(epsi_(0))`

D

`(kR^(2))/(4 epsi_(0))`

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