Question

The two rails of a railway track, insulted from each other and from the ground, are connected to a milli volmeter. What will be the reading of the millivolt meter when a train travels on the track at a speed of $182km{h}^{-1}$ ? The vertical component of earth's magnetic field is $0.2\times {10}^{-4}$ T and the rails are seperated by 1 m

Answer 1

Here v = 180 km/h = 50 m/s,

B = $0.2\times {10}^{-4}T,L=1m$

E = $B\theta l=0.2\times {10}^{-4}\times 50$

= ${10}^{-3}$ V.

So, The voltmeter will record 1 mV.