Current in a coil changes from 4 A to zero in `0.1` second and the emf induced is 100 V. The self inductance of the coil is

Options

A. `0.25` H
B. `0.4` H
C. `2.5` H
D. `4` H

Answer

C

Explanation

e.m.f induced `eta = -L(dI)/(dt)`
or `100 = (-L[0-4])/(0.1)` or ` L = (100 xx 0.1)/(4) = (5)/(2) = 2.5 H`.