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(C) The induced electromotive force $(e)$ across the axle of the train moving through the Earth's magnetic field is given by the formula: $e = Bvl$, w

Vedclass · Accepted Answer

$0.4$

Vedclass · Answer

(C) The induced electromotive force $(e)$ across the axle of the train moving through the Earth's magnetic field is given by the formula: $e = Bvl$, where $B$ is the vertical component of the Earth's magnetic field, $v$ is the velocity of the train, and $l$ is the distance between the rails.Given values:$B = 2 	imes 10^{-5} \, T$$v = 72 \, km/h = 72 	imes \frac{5}{18} \, m/s = 20 \, m/s$$l = 1 \, m$Substituting these values into the formula:$e = (2 	imes 10^{-5} \, T) 	imes (20 \, m/s) 	imes (1 \, m)$$e = 40 	imes 10^{-5} \, V$$e = 4 	imes 10^{-4} \, V$To convert the result into millivolts $(mV)$, we multiply by $10^3$:$e = 4 	imes 10^{-4} 	imes 10^3 \, mV = 0.4 \, mV$.Therefore, the reading of the millivoltmeter is $0.4 \, mV$.

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