Question

A $50mH$ coil carries a current of $2A$. The energy stored, in joules, is

• A. 1
• B. 0.1
• C. 0.05
• D. 0.5

Answer 1

Answer: (B)

Energy stored, $E=\frac{1}{2}L{i}^2$
$=\frac{1}{2}\times 50\times 10^{-3}\times 4=0.1J$