A hollow sphere of radius a carries a total charge Q distributed uniformly over its surface. A small area dA of the sphere is cut off. Find the electric field at the centre due to the remaining sphere.

A cjircular wire-loop of radius a carries a total charge Q distributed uniformly over its length . A small length dL of the wire is cut off. Find the electric field at the centre due to remaining wire.

A cjircular wire-loop of radius a carries a total charge Q distributed uniformly over its length . A small length dL of the wire is cut off. Find the electric field at the centre due to remaining wire.

A circular wire loop of radius R carries a total charge q distributed uniformly over its length. A small length x (ltlt R) of the wire is cut off. Find the electric field at the centre due to the remaining wire.

A circular wire loop of radius R carries a total charge q distributed uniformly over its length. A small length x (ltlt R) of the wire is cut off. Find the electric field at the centre due to the remaining wire.

A circular wire-loop of radius a carries a total charge Q distributed uniformly over its length . A small length dL of the wire is cut off. Find the electric field at the centre due to remaining wire.

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.

There is a hemispherical shell having charge Q uniformly distributed on its surface. Radius of the shell is R. Find electric potential and field at the centre (of the sphere).

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V . The potential at the centre of the sphere is

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V . The potential at the centre of the sphere is

A hollow copper sphere is positively charged, the electric field at its centre will be :