Question

The rails of a railway track are 1.5 m apart and assumed to be insulated from one another.Calculate the emf in volts that will exist between the rails if a train is passing at 100 km/hour.Assume horiz

Answer 1

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.