OJEE Energy in Inductor — practice questions

Explore 2 free Energy in Inductor questions in OJEE Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Energy in Inductor questions and exercises with answers

Showing questions 1–2 of 2.

The energy stored in an inductor of inductance $L$ carrying current $I$ is:Read the answer and worked solution →A coil of self-inductance 2 H carries a current of 4 A. The energy stored in its magnetic field is:Read the answer and worked solution →

Worked practice questions

The energy stored in an inductor of inductance $L$ carrying current $I$ is:

$L I$
$L I^2$
$\tfrac{1}{2} L^2 I$
$\tfrac{1}{2} L I^2$

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Correct answer: D. $\tfrac{1}{2} L I^2$

Energy in an inductor $U_B = \tfrac{1}{2} L I^2$, analogous to kinetic energy $\tfrac{1}{2}mv^2$ (L plays the role of mass/inertia for current).

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A coil of self-inductance 2 H carries a current of 4 A. The energy stored in its magnetic field is:

4 J
16 J
8 J
32 J

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Correct answer: B. 16 J

$U = \tfrac{1}{2} L I^2 = \tfrac{1}{2}(2)(4^2) = 16$ J.