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Physics Electromagnetic Induction Faraday's and Lenz's Law MCQ (Single Correct)

A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity ,The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for

A
the rectangular, circular and elliptical loops
B
the circular and the elliptical loops
C
only the elliptical loop
D
any of the four loops

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The correct answer is:
B

Area coming out per second from the magnetic field is not constant for elliptical and circular loops, so induced emf, during the passage of these loops, out of the field region will not remain constant for the circular and the elliptical loops.

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