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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 varepsilon_0`

B

`-6 a varepsilon_0`

C

`-24 pi a varepsilon_0^r`

D

`-6 a varepsilon_0r`

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The correct Answer is:
B
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