In an inductance coil the current increases from zero to `6` ampere in `0.3` second by which an induced e.m.f. of `60` volt is produced in it. The value of coefficient of self-induction of coil is

Options

A. 3 henry
B. 2 henry
C. 1 henry
D. 1.5 henry

Answer

D

Explanation

`Delta I=6A, Delta t=0.3s, E=30 V`
`E=L(dI)/(dt)`
`therefore L=(30xx0.3)/(6)=1.5 H`.