Charge $q$ is uniformly distributed over a thin half ring of radius $R$. The electric field at the centre of the ring is
$\frac{q}{{2{\pi ^2}{\varepsilon _0}{R^2}}}$
$\frac{q}{{4{\pi ^2}{\varepsilon _0}{R^2}}}$
$\frac{q}{{4\pi {\varepsilon _0}{R^2}}}$
$\frac{q}{{2\pi {\varepsilon _0}{R^2}}}$
Find flux related to shaded face $BCGF$
Three charges $4q,\,Q$ and $q$ are in a straight line in the position of $0$, $l/2$ and $l$ respectively. The resultant force on $q$ will be zero, if $Q = $
In the figure a potential of $+ 1200\, V$ is given to point $A$ and point $B$ is earthed, what is the potential at the point $P$....$V$
Three identical dipoles are arranged as shown below. What will be the net electric field at $M$
Capacity of an isolated sphere is increased $n$ times when it is enclosed by an earthed concentric sphere. The ratio of their radii is