Discussion
In a magnetic circuit, once a flux is setup
Answer: A
Once the flux is set up, no further energy is required to maintain it.
Energy is needed only while the flux is being built up; it is stored in the magnetic field. After that, a steady flux requires no further energy input, just as a steady current in an ideal inductor needs no voltage. In a real coil the only continuing loss is the I2R heat in the winding's resistance, which belongs to the electric circuit, not the magnetic one.
This differs from the electric circuit, where current flowing through resistance consumes energy continuously. A steady magnetic flux does not release energy as heat or light.
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