If the potential at the centre of a uniformly charged hollow sphere of radius $R$ is $V$ then electric field at a distance $r$ from the centre of the sphere is $(r > R)$
$\frac{{VR}}{{{r^2}}}$
$\frac{{Vr}}{{{R^2}}}$
$\frac{{VR}}{r}$
$\frac{{VR}}{{{R^2} + {r^2}}}$
Two identical metal balls of radius $r$ are at a distance $a (a >> r)$ from each other and are charged, one with potential $V_1$ and other with potential $V_2$. The charges $q_1$ and $q_2$ on these balls in $CGS$ esu are
There are four concentric shells $A, B, C $ and $D $ of radii $ a, 2a, 3a$ and $4a$ respectively. Shells $B$ and $D$ are given charges $+q$ and $-q$ respectively. Shell $C$ is now earthed. The potential difference $V_A - V_C $ is :
Two charge $ + \,q$ and $ - \,q$ are situated at a certain distance. At the point exactly midway between them
Variation in electric potential is maximum if one goes
The charge given to a hollow sphere of radius $10\, cm$ is $3.2×10^{-19}\, coulomb$. At a distance of $4\, cm$ from its centre, the electric potential will be