6.A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

7.Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

8.A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

9.A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

10.Two 300 uH coils in series without mutual coupling have a total inductance of