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Q.

A copper rod of length l is rotated about midpoint of rod, perpendicular to the magnetic field B with constant angular velocity ω . The induced emf between the two ends is 

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a

2Bwl2

b

Bwl2

c

Zero

d

12Bωl2

answer is C.

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Detailed Solution

The induced emf between centre and end is Bωl222 with center at a potential and both the ends are at another potential. So no emf is induced between the ends.

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