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Q.

A square coil of side 0.5 m has movable sides.  It is placed such that its plane is perpendicular to uniform magnetic field of induction 0.2 T. If all the sides are allowed to move with a speed of 0.1 ms−1 for 4sec outwards, average induced emf is

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a

Zero

b

0.01 V

c

0.028 V

d

0.072 V

answer is D.

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Detailed Solution

Each side=0.5m     B=0.2T All are movable sidesEach side is moving with a velocity V=0.1 m/s for a time t=4s∴distance moved by each side d=vtd=0.1×4=0.4m e=BNt(A2−A1)    =0.24(1.69−0.25)=0.072V
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