The two rails of a railway track,


The two rails of a railway track, insulated from each other and from the ground, are connected to a millivolt meter. What will be the reading of the millivolt meter when a train travels on the track at a speed of $180 \mathrm{~km} / \mathrm{hr}$ ? The vertical component of the earth's magnetic field is $0.2 \times 10^{-4} \mathrm{~T}$ and the rails are separated by $1 \mathrm{~m}$.


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