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The spokes of a wheel are metallic and their length is 0.5 m. On rotating the wheel at right angles to a uniform magnetic field of 5 x 10-4 tesla, a potential difference of 3.14 mV is produced between the rim and the axis. The rotational speed of the wheel is

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a

8 rotations/sec

b

12 rotations/sec

c

16 rotations/sec

d

20 rotations/sec

answer is A.

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Detailed Solution

We know that, e=12Bl2ω Here ω=2πn∴e=12Bl2(2πn) or n=e/Bl2π or n=3⋅14×10−35×10−4(0⋅5)(3⋅14)=8 rotations/sec

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