A conductor of length L is connected to a dc source of emf `epsilon`. If this conductor is replaced by another conductor of same material and same area of cross-section but of length 3L, how will the drift velocity change?

Explanation

(a) (i) Drift velocity : It is defined as the velocity with which the free electrons get drifted towards the positive terminal under the effect to the applied electric field.
(ii) Relaxation time : It is the average time between two successive collision. It is of the order of `10^(-14)` s at room temperature.
(b) It does not depend on the length of wire.