State the direction of drift velocity of electron with respect to the appliled electric field.

The drift velocity of electrons is given by

Derive the expression for drift velocity of free electron in terms of relaxation time and electric field applied across a conductor.

Assertion: A current flows in a conductor only when there is an electric field within the conductor: Reason: The drift velocity of electron in presence of electric field decreases.

Assertion : Current flows in a conductor only when there is an external electric field within the conductor. Reason: The drift velocity of the electrons is directly proportional to the electric field.

The average velocity of electrons in a conductor in the absence of electric field is

Give relation between drift velocity and electric field.