The two rails of a railway track insulated from each other and the ground are connected to a mil...

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The two rails of a railway track insulated from each other and the ground are connected to a millivoltmeter. What will be the reading of the millivoltmeter, when a train travels at a speed of \( 180 \mathrm{~km} / \mathrm{h} \) along the track? Given that the vertical component of Earth's field is \( 2 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2} \) and the rails are separated by \( 1 \mathrm{~m} \).
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