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When a current of 5A flows through a coil of linear magnetic circuit, it has flux linkages of 2.4 wb-turns. What is the energy stored in the magnetic field of this coil in Joules?

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When a current of 5A flows through a coil of linear magnetic circuit, it has flux linkages of 2.4 wb-turns. What is the energy stored in the magnetic field of this coil in Joules?

(a) 6

(b) 12

(c) 1.2

(d) 2.4

The question was asked in an internship interview.

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

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Correct option is (a) 6

The explanation: Wfld = 1/2 φ*i =  1/2*2.4*5 = 6 Joules.

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