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  • The two rails of a railway track, insulated from each other and the ground, are connected to millivoltmeter. What is the reading of the millivoltmeter when a train passes at a speed of 180 km/hr al

The two rails of a railway track, insulated from each other and the ground, are connected to millivoltmeter. What is the reading of the millivoltmeter when a train passes at a speed of 180 km/hr along the track, given that the vertical component of earth’s magnetic field is 0.2 \times 10^{-4} \mathrm{wb} / \mathrm{m}^2 and rails are separated by 1 metre

Option: 1

\mathrm{10^{-2} volt}


Option: 2

10 \mathrm{mV}


Option: 3

\mathrm{1 volt }


Option: 4

1 \mathrm{mV}


Answers (1)

best_answer

\mathrm{\begin{aligned} & \mathrm{e}=\mathrm{B} \mathrm{lv} \\ & =\left(0.2 \times 10^{-4}\right)(1)(180 \times 5 / 18)=10^{-3} \mathrm{~V} \\ & =1 \mathrm{mV} \end{aligned} }

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Rishabh

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