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MHT CET 2025 (25 Apr, Shift 2) · Self-Inductance & Energy

Self-Inductance & Energy question from MHT CET 2025 (25 Apr, Shift 2)

Q26MHT CET 2025 · 25 APR · SHIFT 2Easy

Self-Inductance & Energy

A coil of wire of radius ' $r$ ' has 600 turns and a self-inductance of 108 mH. The self-inductance of a coil with same radius and 500 turns is

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Answer: (b)

Same radius: $L \propto N^2$ .
$L_2 = 108\times\left(\dfrac{500}{600}\right)^2 = 108\times\dfrac{25}{36} = 75\text{ mH}$
So the answer is (b) 75 mH.

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