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Question: Two rails of a railway track insulated from each other and the ground are connected to a milli voltm...

Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth's magnetic field is 0.2×10−40.2 \times 10 ^ { - 4 } weber /m2/ \mathrm { m } ^ { 2 } and the rails are separated by 1 metre

A

10−210 ^ { - 2 } volt

B

10−410 ^ { - 4 } volt

C

10−310 ^ { - 3 } volt

D

1 volt

Answer

10−310 ^ { - 3 } volt

Explanation

Solution

=0.2×10−4×(180×10003600)×1= 0.2 \times 10 ^ { - 4 } \times \left( \frac { 180 \times 1000 } { 3600 } \right) \times 1 =10−3 V= 10 ^ { - 3 } \mathrm {~V}