Question

An emf of 2 volt is produced in a coil when the current changes at a steady rate from 3 to 2 ampers 1 milli – second. The value of self inductance of the coil will be

• A. Zero
• B. 2 mH
• C. 2 H
• D. 200 mH

Answer 1

The correct option is B 2 mH

$e=-L\left(\frac{di}{dt}\right)$
$2=-L\left[\frac{2-3}{{10}^{-3}}\right]$
$2\times {10}^{-3}=L$
$L=2mH$