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Question

The two rails of a railway track, insulated from each other and the ground, are connected to millivoltmeter. What is the reading of the millivoltmeter when a train passes at a speed of 180 km/hr along the track, given that the vertical component of earth's magnetic field is $$0.2\times 10^{-4}wb/m^2$$ and rails are separated by 1 metre


A
101volt
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B
10 mV
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C
1 volt
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D
1 mV
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Solution

The correct option is D $$1 \ mV$$
$$\varepsilon =Blv$$
$$=(0.2\times 10^{-4})(1)(180\times 5/18)$$
$$=10^{-3}V$$
$$=1mV$$

Physics

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