Question

The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt.What is the self inductance of the coil?

• A. 0.1 H
• B. 0.2 H
• C. 0.4 H
• D. 0.8 H

Answer 1

The correct option is B 0.2 H

$e=M\frac{di}{dt}$

$\Rightarrow 8=L\frac{(4-2)}{0.05}$

$\Rightarrow L=0.2H$