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I thought this question when I learn about the superconductor which has no resistance.

If I made the round wire with the superconductor, I think it is possible for the current to flow through the wire that power consumption is zero. But I don't know that it is possible to flow permanently.

It is right that the round wire made with superconductor has no resistance. But I think the electron that flows through the wire does an acceleration exercise(circle motion), so it releases the electromagnetic waves.

But I don't know the exact answer. Is it possible to maintain the electric current permanently using the superconductor?

Is electricity perpetual in a superconductor system? (I find it, but I think it is not clear answer)

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I think the following post-How can I put a permanent current into a superconducting loop? explains in good detail about what you are asking. In short, it is possible to maintain an electric current in a superconducting loop as long as the loop is superconducting.

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the electron that flows through the wire does an acceleration exercise(circle >motion), so it releases the electromagnetic waves.

No. A constant current, regardless whether it's in a superconductor, in a loop or in a straight wire, corresponds to a constant magnetic field. Check Maxwell equations.

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