Question

A boy makes a long air core coil of manganin and connects it across 100 V
d.c. source. A current of 1 A flows in the circuit. When the same coil is
connected across 100 V a.c. source, the current in the circuit reduces to
0·6 A. Explain the reason for decrease in current.

Answer 1

Answer:

when a. C. current is passed through the coil a back emf is generated in the coi due to electromagnetic induction which opposes the applied a. C. voltage. due to this the current in the coil gets reduced