When a material does this, we call it an electric conductor. Essentially all metals are conductors. ... There is an electric current in a wire because there is an electric field inside the wire.

Why, then is the electrostatic field inside a conductor zero? Solution 1.16: In an atom, number of electrons and protons are equal and the electric fields bind the atoms to neutral entity.

Electric field originates from positive charge. It is perpendicular to the surface of the conductor. Also, inside the conducting sphere, it will be zero. All these conditions are satisfied in Fig (i).