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Number of free electrons

The electrons which are not attached to the nucleus of a atom and free to move when external energy is applied are called free electrons.

Electric field is a region around the charged particle within which the other charged particle will experience a repulsive or attractive force.

Valence electrons are loosely attached to the nucleus of a atom. When small amount of external energy in form of heat or light is applied to the valence electrons then they get pulled away from the parent atom and becomes free.

The force of attraction of the nucleus does not act on the free electron.The flow of free electrons in a material is called an electric current. The moving free electrons will transmit electric current from one point to other.

Materials which contain free electrons will conduct electric current. Materials which does not contain free electrons does not conduct electric current.
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