What is the formula for the area of the magnet in the design of PMDC motors?

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answerhappygod
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What is the formula for the area of the magnet in the design of PMDC motors?

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a) area of magnet = flux * 4.95 * residual flux density
b) area of magnet = flux / 4.95 * residual flux density
c) area of magnet = flux * 4.95 / residual flux density
d) area of magnet = 1/flux * 4.95 * residual flux density
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