The electrostatic potential inside a charged spherical ball is given by `phi=ar^2+b` where r is the distance from the centre and

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)`

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. T

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