Q.
Figure shows, in cross section, two solid spheres with uniformly distributed charge throughout their volumes. Each has radius $R$. Point $P$ lies on a line connecting the centres of the spheres, at radial distance $R / 2$ from the center of sphere $1$ . If the net electric field at point $P$ is zero and $Q_{1}$ is $64\, \mu C$, what is $Q _{2}$ (in $\mu C$ )
Electric Charges and Fields
Solution: