Question

If the back e.m.f. induced in a coil, when current changes from 1A to zero in one millisecond, is 5 volts, the self-inductance of the coil is (A) 5 H (B) 1 H (C) 5 x 10-3H (D) 5 x 103H​

Answer 1

Answer:

option D is correct

Explanation:

e=−Ldidt

e=4Vanddidt=0−110−3=−1∖10−3

−110−3(−L)=⇒L=4×10−3henry