Let $P\left( r \right) = {Q \over {\pi {R^4}}}r$ be the change density distribution for a solid sphere of radius $R$ and total charge $Q$. For a point $'p'$ inside the sphere at distance ${r_1}$ from the center of the sphere, the magnitude of electric field is :
${Q \over {4\pi \,{ \in _0}\,r_1^2}}$
${{Qr_1^2} \over {4\pi \,{ \in _0}\,{R^4}}}$
${{Qr_1^2} \over {3\pi \,{ \in _0}\,{R^4}}}$
$0$
Solution
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