Question

A coil of resistance $10\Omega$ and an inductance $5\text{H}$ are connected to a $100\text{volts}$ battery. Then energy stored in the coil is :-

Answer 1

Given:
$R=10\Omega$
$L=5H$
$V=100$ volt
The energy stored in coil is given by , $U=\frac{1}{2}L{i}^2[\because i=\frac{V}{R}]$

$U=\frac{1}{2}\times 5\times {\left(\frac{100}{10}\right)}^2=250\text{J}$

Hence, option (d) is the correct answer.