Question

The average emf induced in a coil in which a current changes from 0 to 2 A in 0.05 s is 8 V. The self inductance of the coil is

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

Answer 1

Answer: (B)

0.2 H

Answer 2

By using $|e| = L\frac{di_{1}}{dt};$ $8 = L \times \frac{(2 - 0)}{0.05} \Rightarrow L = 0.2H$