What is the self inductance of a coil in which an induced emf of 2V is set up, when the current is changing at the rate of ` 4 A s ^( - 1 ) `

Options

A. 0.5 mH
B. 0.05 H
C. 2 H
D. 0.5 H

Answer

D

Explanation

Induced emf ` e = ( Ldi) /( dt )`, hence ` e = 2V, (di )/( dt ) = 4 As ^( -1 ) `
` rArr 2 = L xx 4 `
` L = ( 2 )/( 4 ) = 0. 5 H `