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MHT CET 2024 (2 May, Shift 2) · Self-Inductance & Energy

Self-Inductance & Energy question from MHT CET 2024 (2 May, Shift 2)

Q49MHT CET 2024 · 2 MAY · SHIFT 2Medium

Self-Inductance & Energy

An air cored coil has self inductance of 0.1 H. A soft iron core of relative permeability 1000 is introduced and the number of turns is reduced to $\left(\frac{1}{10}\right)$ th. The value of self inductance is now

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Answer: (c)

$L \propto \mu_r N^2$ .
$L' = 0.1 \times 1000 \times \left(\dfrac{1}{10}\right)^2 = 1$ H
So the answer is (c) 1 H.

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