A straight conductor of uniform cross-section carries a current I. Let s = specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to their drift velocities only, is

Correct option is A

The correct answer is: (A) Is Momentum = mass × velocity; drift momentum per electron = e × drift velocity. Using I = nAev, momentum per unit length is I × s, where s = specific charge (e/m)
Information Booster: • Current I and specific charge s directly relate to total electron momentum.