Four charges $ + Q,\, - Q,\, + Q,\, - Q$ are placed at the corners of a square taken in order. At the centre of the square
$E = 0,\,V = 0$
$E = 0,\,V \ne 0$
$E \ne 0,\,V = 0$
$E = 0,\,V \ne 0$
There is a uniformly charged non conducting solid sphere made of material of dielectric constant one. If electric potential at infinity be zero, then the potential at its surface is $V$. If we take electric potential at its surface to be zero, then the potential at the centre will be
Three charges $q, \sqrt 2q, 2q$ are placed at the corners $A, B$ and $C$ respectively of the square $ABCD$ of side $'a'$ then potential at point $'D'$
Calculate potential on the axis of a ring due to charge $Q$ uniformly distributed along the ring of radius $R$.
Write an equation for potential due to linear charge distribution.
The two thin coaxial rings, each of radius $'a'$ and having charges $+{Q}$ and $-{Q}$ respectively are separated by a distance of $'s'.$ The potential difference between the centres of the two rings is :