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Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track ? Given that – the horizontal component of earth’s magnetic field `B_(H)` is `0.2 xx 10–4 Wb// m^(2)` and rails are separated by 1 metre.

A

`10^(-2)mV`

B

`10mV`

C

`10^(2)mV`

D

`1mV`

Text Solution

Verified by Experts

The correct Answer is:
D
`v=180kmh^(-1)=(180xx1000)/(60xx60)=50ms^(-1)`
`l=1m,B=0.2xx10^(-4)Wbm^(-2)`
`e=Blv=0.2xx10^(-4)xx1xx50=10^(-3)V=1mV`
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