A small part of `dl` length is removed from a ring having charge per unit length `lamda`. Find electric field at centre due to remaining ring.

A semi-cricular arc of radius a is charged unformly and the charge per unit length is lambda . The electric field at the centre is

A semicircular are of radius a is charged uniformly and the charge per unit length is lambda . The electric field at its centre is

The electric field at a distance r from a long wire having charge per unit length lambda is

A small element l cut from a circular ring of radius a and lamda charge per unit length. The net electric field at the centre of ring is

(a) Two pont charges 9 Q and - 25 Q are fixed at separation d .At what distance from 9 Q , electric field is zero on the line joining the charges ? (b) A circular ring of radius r carries a total charge Q distributed uniformly over it. A small length dl of wire is removed . Find electric field at center due to the remaining ring.

A quarter ring of radius R is having uniform charge density lambda . Find the electric field and potential at the centre of the ring.

A circular ring of radius r carries a charge Q uniformly spread on it. A small length dl is cut off. Find the electric field at the centre due to the remaining wire.

Find the electric field at centre of semicircular ring shown in figure . .

Find the electric field at centre of semicircular ring shown in figure . .