When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The self - inductance of the coil is :

Options

A. 6 H
B. 0.67 H
C. 3 H
D. 1.67 H

Answer

D

Explanation

According to Faraday.s law of electromagnetic induction,
Induced emf, `e=(Ldi)/(dt)`
`50=L(5-2)/(0.1 sec)`
`rArr L=(50xx0.1)/(3)=(5)/(3)=1.67 H`