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Grade: upto college level
        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? The vertical component of earth’s magnetic field is 0.2 × 10^-4 T and the rails are separated by 1 m. 
5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
							Sol. v = 180 km/h = 50 m/s
B = 0.2 × 10^–4 T, L = 1 m
E = Bvℓ = 0.2 I 10^–4 × 50 = 10^–3 V
∴ The voltmeter will record 1 mv.

						
5 years ago
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