Electromagnetic Induction and Alternating Current 2 Question 13

14. The two rails of a railway track, insulated from each other and the ground, are connected to a millivoltmeter. What is the reading of the millivoltmeter when a train travels at a speed of 180km/h along the track given that the vertical components of earth’s magnetic field is 0.2×104Wb/m2 and the rails are separated by 1m ? Track is South to North.

(1981,4M)

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Answer:

Correct Answer: 14. 1mV

Solution:

  1. Potential difference between the two rails :

V=Bvl (When B,v and I all are mutually perpendicular to each other)

=(0.2×104)180×518=103V=1mV



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