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Q.

A conducting U–tube can slide inside another as shown in fig. maintaining electrical contacts between them. The magnetic field is perpendicular to plane of paper. If each tube move towards each other with constant speed υ , then emf induced in the circuit in terms of B, l  and υ where l is the width of each tube.

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a

2Blυ

b

Blυ

c

Zero

d

Blυ

answer is B.

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Detailed Solution

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Induced emf is in same direction

e=e1+e2

e=BlV+BlV=2BlV

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