The electrostatic potential inside a charged \( \mathrm{P} \) spherical ball is given by \( \phi...

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The electrostatic potential inside a charged
\( \mathrm{P} \) spherical ball is given by \( \phi=a r^{2}+b \) where \( \mathrm{r} \) is

W the distance from the centre; \( a, b \) are constants. Then the charge density inside the ball is:
(A) \( -24 \pi a \varepsilon_{0} r \)
(B) \( -6 \pi a \varepsilon_{0} r \)
(C) \( -24 \pi a \varepsilon_{0} \)
(D) \( -6 a \varepsilon_{0} \)
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