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Q.

A wheel with 10 metallic spokes each of 1m long is rotated with a speed of 100  rad/sec in a plane normal to earth’s magnetic field of BH=4×10−5T . EMF induced between the axle and rim of wheel is

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a

2×10−3V

b

6×10−3V

c

4×10−3V

d

2×10−2V

answer is A.

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Detailed Solution

e=12Bl2w=12(4×10−5)(1)2(100)=2×10−3volt

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