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The two rails of a railway track, insulated from each other and the ground, are connected to a milli voltmeter. What is the reading of the milli voltmeter when a train travels at a speed of `180 km//hours along the track, given that the vertical components of earth's magnitic field is `0.2xx10^(_4) weber//m^(2)` & the rails are separated by 1 meter?

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The correct Answer is:
A
This is based on motional emf.

`e=vBl=50xx0.2xx10^(-4)xx1=(10^(-3))volt =1milli volt.`
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