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Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is one metre. A train is traveling with a velocity of `72 km ph` along the track. The reading of the millivoltmetre (in `m V`) is : (Vertical component of the earth's magnetic induction is `2 xx 10^(-5) T`)

A

`144`

B

`0.72`

C

`0.4`

D

`0.2`

Text Solution

Verified by Experts

`e = B_(v)lu = 2 xx 10^(-5) xx 1 xx 20 = 0.4 mV`
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