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What is the meaning of useful flux?

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in Design of Electrical Machines by (687k points)
What is the meaning of useful flux?

(a) the flux which is being created in the machine

(b) the flux which can be used

(c) the flux which can produce the output

(d) the flux that is wasted

I got this question in an online quiz.

My enquiry is from Pole Design topic in division Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Right choice is (c) the flux which can produce the output

The explanation is: Total flux is the maximum amount of flux that is being generated by the current flowing in the circuit. Useful flux is nothing but the flux which can produce the output in the machine.

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