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ELECTRON DRIFT VELOCITY

    : Free electrons in metal or conductor are moving in random speed and direction in normal condition. These electrons collide with ions and changes direction again and again. So in this stage they have no particular direction.
    When an electric field such as battery, applied across this conductor, free electrons drift towards the higher potential, collide with atoms and looses their kinetic energy. But due to applied external electric field they regain the energy and moves towards positive terminal. Under this type external electric field, the net velocity with which free electrons drifted towards the positive end is known as electron drift velocity.

    DRIFT CURRENT:

When we apply an external electric field across a conductor, the electrons drift causes flow of current. The current due to drifting of electrons in a conductor is known as drift current.
All currents are drifting current.

ELECTRON MOBILITY
: With increasing external electric field intensity, increases the electrons speed to move towards positive terminal.
So electron mobility is defined as the quickness of electrons movement through a conductor under external electric field.

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