Define the term mobility of charge carriers in a current carrying conductor. Obtain the relation for mobility in terms of relaxation time.

Net charge in a current-carrying conductor is

The mobility of charge carries increases with

Define the term 'mobility' of charge carriers. Write its S.I. unit.

The dimensions of mobility of charge carriers are

Define the term 'drift velocity' of electrons in a current carrying conductor. Obtain the relationship between the current density and the drift velocity of electrons.