The inductance of a coil in which a current of 0.2 A is increasing at the rate of 0.5 A/s represents a power flow of 0.5 W is

Options

A. 10 H
B. 5 H
C. 15 H
D. 50 H

Answer

B

Explanation

`E=(1)/(2)LI^(2)`
`implies P=(dE)/(dt)=(1)/(2)Lxx2I(dI)/(dt)`
`P=LI(dI)/(dt)`
`implies L=(P)/(I(dI)/(dt))=5H`