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The electrostatic potential inside a cha...

The electrostatic potential inside a charged spherical ball is given by `phi=ar^2+b` where r is the distance from the centre and a, b are constants. Then the charge density inside the ball is:

A

`-24 pi a epsi_(0) r`

B

`-6pi a epsi_(0) r`

C

`-24 pi a epsi_(0)`

D

`-6 a epsi_(0)`

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The correct Answer is:
D
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