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What is the value of the reluctance factor in the calculation of the intensity of magnetic field?

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What is the value of the reluctance factor in the calculation of the intensity of magnetic field?

(a) 1

(b) 2

(c) 1.15

(d) 1,45

I have been asked this question in a national level competition.

Question is from Design Preliminaries in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Right option is (c) 1.15

Easiest explanation: The reluctance factor is one of the factors made use of in the calculation of the intensity of magnetic field. The value of the reluctance factor is around 1.15 generally.

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