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MHT CET 2021 (24 Sep, Shift 1) · Self-Inductance & Energy

Self-Inductance & Energy question from MHT CET 2021 (24 Sep, Shift 1)

Q69MHT CET 2021 · 24 SEP · SHIFT 1Easy

Self-Inductance & Energy

. If the current of ' $I$ ' A gives rise to a magnetic flux ' $\phi$ ' through a coil having ' $N$ ' turns then mangetic energy stored in the medium surrounding the coil is

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Answer: (b)

$LI = N\phi \Rightarrow L = \dfrac{N\phi}{I}$
$U = \tfrac12 L I^2 = \tfrac12\cdot\dfrac{N\phi}{I}\cdot I^2 = \dfrac{N\phi I}{2}$
So the answer is (b) $\dfrac{N\phi I}{2}$ .

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