Two rails of a railway track, 1 m apart and insulated from each other and the ground are connected t

Question

Two rails of a railway track, 1 m apart and insulated from each other and the ground are connected to a millivoltmeter. What is the reading on milli-voltmeter when the train travels at a speed of $20 \mathrm{~m} / \mathrm{s}$ along a track (given that the vertical component of earth's magnetic field is $0.2 	imes 10^{-4} \mathrm{~T}$ )\

Professor PC Thomas Classes · Answer

$\varepsilon=$ Blv $\quad=0.2 	imes 10^{-4} \mathrm{~T}$ $$ \begin{aligned} & \mathrm{l}=1 \mathrm{~m} \ & \mathrm{v}=20 \mathrm{~m} / \mathrm{s} \end{aligned} $$ Calculate $\varepsilon$\