The mobility of the charge carriers increases with

Step-by-step solution

The mobility of charge carriers in a conductor is defined as the ratio of the drift velocity v_d to the applied electric field E . The expression for drift velocity is v_d = eE m , where e is the charge of the carrier, is the average relaxation time (average collision time), and m is the mass of the carrier. Substituting this into the definition of mobility: = v_d E = e m . From the relation = e m , it is evident that the mobility is directly proportional to the average collision time . Therefore, mobility increase