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For a linear electromagnetic circuit, which of the following statement is true?

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For a linear electromagnetic circuit, which of the following statement is true?

(a) Field energy is less than the Co-energy

(b) Field energy is equal to the Co-energy

(c) Field energy is greater than the Co-energy

(d) Co-energy is zero

This question was addressed to me by my college professor while I was bunking the class.

Question is taken from Singly Excited Magnetic Systems topic in chapter Magnetic Circuits of Electrical Machines

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Correct option is (b) Field energy is equal to the Co-energy

Easy explanation: Wfld=Wfld^1=1/2 φ*i=1/2 F*∅.

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