Question

A coil of resistance $10\Omega$ and an inductance $5H$ is connected to a $100V$ battery. The energy stored in the coil is

• A. $325erg$
• B. $125J$
• C. $250erg$
• D. $250J$

Answer 1

Answer: (D)

$250J$

Current $I=\frac{V}{R}=\frac{100}{10}=10A$

Energy, $E=\frac{1}{2}{LI}^2$

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