A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it

Step-by-step solution

Drift velocity of the electron is given as v_ d = e E m where, e= charge on electron, E= electric field, = relaxation time and m= mass of the electron. Since, v_ d = e V m l Since, e, V, m and l are constant . v_ d On increasing the temperature of metal wire, relaxation time decreases, therefore drift velocity of electrons also decreases. But on increasing temperature of metal wire, thermal velocity of electron increases.