The magnitude of the induced emf in a coil of inductance 30 mH in which the current changes from 6A to 2A in 2s is

Options

A. 0.06 V
B. 0.6 V
C. 1.06 V
D. 6 V

Answer

A

Explanation

The magnitude of induced emf,
`|e|=-L(di)/(dt)Rightarrowe=-30xx10^(-3)xx((6-2)/(2))`
`=-30xx10^(-3)xx(4)/(2)=-0.06V`