Question

A coil has $100$ turns. When a current of $5A$ produces a magnetic flux of $1\mu Wb$, the coefficient of self induction is :

• A. $10\mu H$
• B. $20\mu H$
• C. $30\mu H$
• D. $40\mu H$

Answer 1

The correct option is B $20\mu H$

$N\varphi =Li$
$L=\frac{N\varphi }{i}$
=$\frac{100\times 1\times {10}^{-6}}{5}$
=$20\times {10}^{-6}H$
=$20\mu H$