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
B
10 mV
C
1 volt
D
1 mV

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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