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The torque induced beyond the pole shoes in the DC machine is?

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The torque induced beyond the pole shoes in the DC machine is?

(a) 0

(b) 2/pi *phi *i

(c) 4/pi *phi *i

(d) none of the mentioned

I have been asked this question in an international level competition.

This key question is from Torque in DC Machines topic in division Electromechanical Energy Conversions of Electrical Machines

1 Answer

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Best answer
Right option is (a) 0

Easiest explanation: The magnetic field vanishes at the pole terminals and thus the cross product with the magnetic field yields zero.

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