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Two parallel rails of a railway track in...

Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is one metre. A train is traveling with a velocity of `72 km ph` along the track. The reading of the millivoltmetre (in `m V`) is : (Vertical component of the earth's magnetic induction is `2 xx 10^(-5) T`)

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