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What is the formula for the flux in pole body?

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What is the formula for the flux in pole body?

(a) flux in pole body = leakage coefficient * useful flux per pole

(b) flux in pole body = leakage coefficient / useful flux per pole

(c) flux in pole body = leakage coefficient – useful flux per pole

(d) flux in pole body = leakage coefficient + useful flux per pole

I have been asked this question in exam.

My query is from Design of Rotor topic in section Design of Synchronous Machines of Design of Electrical Machines

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Right choice is (a) flux in pole body = leakage coefficient * useful flux per pole

The explanation is: The leakage coefficient is obtained first from its formula. Next, the value of useful flux per pole is calculated and this gives the flux in pole body value.

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