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If the torque induced is zero in the dc machine, it can be said that ____________

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If the torque induced is zero in the dc machine, it can be said that ____________

(a) current is zero

(b) flux can be zero

(c) current or flux=0

(d) any of the mentioned

I had been asked this question in an interview for job.

I'm obligated to ask this question of Torque in DC Machines in chapter Electromechanical Energy Conversions of Electrical Machines

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Right option is (a) current is zero

The best I can explain: The torque at steady state of operation is zero as the emf induced is equal to the source voltage. Also the the very much starting the current will be zero which will not let the emf to get induced.

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