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MHT CET 2024 (11 May, Shift 2) · Self-Inductance & Energy

Self-Inductance & Energy question from MHT CET 2024 (11 May, Shift 2)

Q48MHT CET 2024 · 11 MAY · SHIFT 2Medium

Self-Inductance & Energy

A closely wound coil of 100 turns and of cross-section $1\text{ cm}^{2}$ has coefficient of self inductance 1 mH. The magnetic induction at the centre of the core of a coil when a current of 2 A flows in it, will be (in $\text{Wb/m}^{2}$ )

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Answer: (a)

Flux linkage $N B A = L I$ , so $B = \dfrac{L I}{N A}$ .
$B = \dfrac{10^{-3} \times 2}{100 \times 10^{-4}} = \dfrac{2\times 10^{-3}}{10^{-2}} = 0.2$ Wb/m $^2$
So the answer is (a) 0.2.

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