Q 1134778652.     The electrostatic potential inside a charged spherical ball is given by `phi=ar^2+b`, where `r` is the distance from the centre; `a, b` are constants. Then the charge density inside ball is :

JEE 2011
A

`-6aepsi_0r`

B

`-24piaepsi_0r`

C

`-6aepsi_0`

D

`-24aepsi_0`

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