Q. If an insulated non-conducting sphere of radius $R$ has charge density $\rho.$ The electric field at a distance $r$ from the centre of sphere $(r < R)$ will be
A) $\frac{\rho\ R}{3\varepsilon_{0}}$
B) $\frac{\rho\ r}{\varepsilon_{0}}$
C) $\frac{\rho\ r}{3\varepsilon_{0}}$
D) $\frac{3\rho\ R}{\varepsilon_{0}}$
Explanation
(c) For non-conducting sphere $E_{in} = \frac{k.Qr}{R^{3}} = \frac{\rho r}{3\varepsilon_{0}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.