Question

Current in a coil of self-inductance $2H$ is increasing as $i=2\sin \left(t^2\right)$. The amount of energy spent during the period when the current changes from $0$ to $2A$ is

• A. $1J$
• B. $2J$
• C. $3J$
• D. $4J$

Answer 1

Answer: (D)

$4J$

Energy $=\frac{1}{2}L{i}^2=\frac{1}{2}\left(2\right)\left(4\right)=4J$