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MHT CET 2023 (13 May, Shift 1) · Lenz's Law, Eddy Currents & Induced Electric Field

Lenz's Law, Eddy Currents & Induced Electric Field question from MHT CET 2023 (13 May, Shift 1)

Q18MHT CET 2023 · 13 MAY · SHIFT 1Medium

Lenz's Law, Eddy Currents & Induced Electric Field

The magnet is moved towards the coil with speed ' $V$ '. The induced e.m.f. in the coil is ' $e$ '. The magnet and the coil move away from one another each moving with speed ' $V$ '. The induced e.m.f. in the coil is

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Answer: (b)

Induced emf depends on the rate of flux change, i.e. on the relative speed of magnet and coil.
First case: relative speed $V$ gives emf $e$ .
Second case: each moves away with $V$ , relative speed $2V$ , so emf $= 2e$ (opposite sign).
So the answer is (b) $2e$ .

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