The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance

1. 0.138 H

2. 1.389 H

3. 138.88 H

4. 13.89 H

Doubtly Asked 30 Oct 2026 NEET UG 2018 Practice test neet Save WhatsApp Report

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Answer: 4. 13.89 H

Energy stored in an inductor: $U=\tfrac12LI^2$.

$$L=\frac{2U}{I^2}=\frac{2\times25\times10^{-3}}{(60\times10^{-3})^2}=\frac{0.05}{3.6\times10^{-3}}\approx13.89\ \mathrm{H}$$

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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