Figure shows three circular arcs, each of radius $R$ and total charge as indicated. The net electric potential at the centre of curvature is
$\frac{Q}{{4\pi { \in _0}R}}$
$\frac{Q}{{2\pi { \in _0}R}}$
$\frac{2Q}{{\pi { \in _0}R}}$
$\frac{Q}{{\pi { \in _0}R}}$
Electric charges having same magnitude of electricicharge $q$ coulombs are placed at $x=1 \,m , 2 \,m , 4 \,m$, $8 \,m$....... so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive, what will be the potential at $x=0$ ?
Calculate potential on the axis of a ring due to charge $Q$ uniformly distributed along the ring of radius $R$.
$512$ identical drops of mercury are charged to a potential of $2\, V$ each. The drops are joined to form a single drop. The potential of this drop is ......... $V.$
Write an expression for potential at the point outside a uniformly charged spherical shell outside on the surface and inside the shell.
$125$ identical drops each charged to the same potential of $50\;volts$ are combined to form a single drop. The potential of the new drop will be......$V$