Question

When the current in a coil changes from 2A to 4A in 0.05 sec, an emf of 8 volts is induced in the coil, the coefficient of self-induction of the coil is : 

(a) 0.8 H 

(b) 0.4 H 

(c) 0.2 H 

(d) 0.1 H

Answer 1

Correct option (c) 0.2 H

Explanation:

The induced emf in the coil is given by