Question

An inductor of inductance \[ 5\,\text{H} \] is carrying an electric current of \[ 4\,\text{mA}. \] Then the energy stored in the inductor is

• A. \[ 50\,\mu\text{J} \]
• B. \[ 1000\,\mu\text{J} \]
• C. \[ 40\,\mu\text{J} \]
• D. \[ 20\,\mu\text{J} \]

Hint:

For an inductor, \[ \boxed{U=\frac12 LI^2} \] Always convert current from mA to A before substitution. \[ 1\,\text{mA}=10^{-3}\,\text{A}. \]

Answer 1

The Correct Option is C