A steady current of 1 amperes is passed through a long solenoid of length l and number of turns N.
Obtain a relation for the self inductance of the solenoid.

A steady current of 1 amperes is passed through a long solenoid of length 1 and number of turns N When an alternating! current is applied to an electrical element, the current in it leads the voltage by pi//2 . Identify the- element.

Three electrolytic cells A, B, C containing solutions of ZnSO_4, AgNO_3 and CuSO_4 , respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?