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What is the formula for the rms value of the magnetizing current?

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What is the formula for the rms value of the magnetizing current?

(a) rms value of the magnetizing current = maximum magnetizing current / peak factor

(b) rms value of the magnetizing current = maximum magnetizing current * peak factor

(c) rms value of the magnetizing current = maximum magnetizing current + peak factor

(d) rms value of the magnetizing current = maximum magnetizing current – peak factor

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My enquiry is from Specific Permeance & Calculation of Magnetizing Current in division Principles of Magnetic Circuit Design of Design of Electrical Machines

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Right answer is (a) rms value of the magnetizing current = maximum magnetizing current / peak factor

Best explanation: The maximum value of the magnetizing current and the peak factor are calculated first. On substitution, the rms value of the magnetizing current is obtained.

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