For a solid sphere of radius \( R \) and total charge \( Q \), let the charge distribution be \(...

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For a solid sphere of radius \( R \) and total charge \( Q \), let the charge distribution be \( \rho=\frac{Q r}{\pi R^{4}} \). Then, for a point \( P \) distant \( r_{1} \) from centre of sphere (math xmlns=http://www.w3.org/1998/Math/MathMLmsubmir/mimn1/mn/msubmo</momiR/mi/math) field is 
(a) 0
(b) \( Q / 4 \pi \varepsilon_{0} r_{1}^{2} \)
(c) \( \frac{Q r_{1}^{2}}{3 \pi \varepsilon_{0} R^{4}} \)
(d) \( \frac{Q r_{1}^{2}}{4 \pi \varepsilon_{0} R^{4}} \)
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