The energy density in the electric fieled created by a point change falls off with the distanse from the point charge as

The energy density in the electric field created by a point charge falls off with the distance from the point charge as

How does electric field at a point change with distance r from an infinite thin sheet of charge?

How does electric field at a point change with distance r from an infinitely long charged wire?

A small sphere carries a charge of 20muC. The energy density of electric field at a point 25 cm away from the centre of the sphere in air is

A small sphere carries a charge of 20muC . The energy density of electric field at a point 25 cm away from the centre of the sphere in air is

A point P is at a distance r from a point charge q. if at point P, the electric potential is 300 V, and the electric field intensity is 75 V/m, then the distance of P from the point charge is