1.

A metre gauge train is heading north with speed 54 km/hr in earth’s magnetic field 3 x 10–4 T. The e.m.f. induced across the axle joining the wheels is ______. (A) 0.45 mV (B) 4.5 mV (C) 45 mV (D) 450 mV

Answer»

(B) 4.5mV

e = vlb

= 54 x \(\frac{5}{18}\) x 1 x 3 x 10-4 

= 45 x 10-4 = 4.5mV



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