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Two rails of a railway track, insulated ...

Two rails of a railway track, insulated from each other and the ground, are connected to a millivoltmetre. What is the reading of the millivoltmetre when a train travels at a speed of 20 `ms^(-1)` along the track? Given that the vertical component of earth's magnetic field is `0.2xx10^(-4)"Wbm"^(-2)` and the rails are separated by 1 m

A

4 mV

B

0.4 mV

C

80 mV

D

10 mV

Text Solution

Verified by Experts

The correct Answer is:
B
As, Potential difference, e = Bvl
`=(0.2xx10^(-4))(20)(1)V`
= 0.4 mV
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