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The two rails of a railway track, insul...

The two rails of a railway track, insulataed form each other and from the ground, are connected to a millivoltmeter. What will be the reading of the millivoltmeter when a train travels on the track at a speed of `180km h^(-1)?` The vertical component of earth's magnetic field is` 0.2 xx10^(-4)` and the rails are separted by 1m.

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`=B_(v)vt=0.2xx10^(-4)xx180xx(5)/(18)xx1`
`=10^(-3)V=1mV`
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