Calculate the electric potential due to a uniformly charged rod at a point on its perpendicular bisector.

(iii) uniformly charged ring at a point on its axis.

(iv) uniformly charged disc at a point on its axis. Also show what happens when the distance of the field point is very large compared to its radius.

(v) infinite plane sheet of charge with uniform surface charge density at a point near to it.

(1) when the surface is parallel to $YZ$ -plane.

Find the electric flux through the surface in the following cases:

An uniform electric field of intensity $6\times {10}^3 \mathrm{N}/\mathrm{C}$ is directed along, $X$ -axis. The length and breadth of a rectangular plane surface is $1 \mathrm{m}$ and $0.5 \mathrm{m}$ respectively.

(ii) When the surface is parallel to $XY$ -plane.