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NEET 2005 (AIPMT) · Lenz's Law, Eddy Currents & Induced Electric Field

Lenz's Law, Eddy Currents & Induced Electric Field question from NEET 2005 (AIPMT)

Q33NEET 2005 · AIPMTMedium

Lenz's Law, Eddy Currents & Induced Electric Field

As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. $V$ volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is

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Answer: (a)

Emf is the work done per unit charge in taking it once round the loop: $\varepsilon = \frac{W}{Q}$ .
$W = Q\varepsilon = QV$ (the induced electric field is non-conservative, so the round-trip work is not zero).
So the answer is (a) $QV$ .

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