Q.

Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth's magnetic field is  0.2×10−4 weber /m2 and the rails are separated by 1 metre

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a

10-2 volt

b

10-4 volt

c

10-3 volt

d

1 volt

answer is C.

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Detailed Solution

e=Bv.vl=0.2×10−4×180×10003600×1=10−3V
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Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth's magnetic field is  0.2×10−4 weber /m2 and the rails are separated by 1 metre