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The Two Rails of a Railway Track, Insulated from Each Other and from the Ground, Are Connected to a Millivoltmeter. - Physics


The two rails of a railway track, insulated from each other and from the ground, are connected to a millivoltmeter. What will be the reading of the millivoltmeter when a train travels on the track at a speed of 180 km h−1? The vertical component of earth's magnetic field is 0.2 × 10−4 T and the rails are separated by 1 m.

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Velocity of the train, v = 180 km/h = 50 m/s

Earth's magnetic field, B = 0.2 × 10−4 T

Separation between the railings, l = 1 m

Induced emf, e = Bvl = 0.2 × 10−4 × 50 = 10−3 V

So, the voltmeter will record 1 mV as the reading.

Concept: Induced Emf and Current
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 16 Electromagnetic Induction
Q 30 | Page 308
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