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

Fill in the blank with the correct answer from the options given below.

decreases, thermal velocity of the electrons increases

Thermal velocity will increase: It is given that the temperatures of metal wire increases. So, the KE of electron also increases, so the thermal velocity will increase. The drift velocity will decrease: Due to the increase in the number of collisions, the relaxation time τ will decrease

The correct answer is Option (4) → decreases, thermal velocity of the electrons increases