What is the air gap flux density for PMDC motor?

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answerhappygod
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What is the air gap flux density for PMDC motor?

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a) Bg= µ0(tm/lg) Hm
b) Bg= – µ0Hm
c) Bg= – µ0(tm/lg) Hm
d) Bg= – µ0(lg/tm) Hm
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