Let \( P(r)=\frac{Q}{\pi R^{4}} r \) be the charge density distribution for a solid sphere of ra...

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Let \( P(r)=\frac{Q}{\pi R^{4}} r \) be the charge 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 centre of the sphere, the magnitude of electric field is:
(a) 0
(b) \( \frac{Q}{4 \pi \varepsilon_{0} r_{1}^{2}} \)
(c) \( \frac{Q r_{1}^{2}}{4 \pi \varepsilon_{0} R^{4}} \)
(d) \( \frac{Q r_{1}^{2}}{3 \pi \varepsilon_{0} R^{4}} \)
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