hey everyone.

im doing superconductors in high school, and they don't seem to make sense the way my teacher explains it. can anyone help?

as i understand it, a superconductor has zero resistance at low temperatures. so you can pass a current through a circular superconductor and it will store the energy with zero loss. yet now it acts as a solenoid, and a magnetic field is produced, without any loss of electrical potential. Does this not defy the law of conservation of energy?

thanks for your help

No it does not. Because a superconductor has zero resistance with no current, a changing magnetic field would break up its equilibrium state by introducting an electric field. So, what it does is expel magnetic fields or in general keep the magnetic field flux constant.

The reason that this does not violate any energy conservation laws is that we have to keep the thing cooled down then it starts doing these tricks, which takes energy.

A superconducting current will produce a magnetic field. However, if you draw energy from that field in any way you will reduce the current flow in the superconductor. So, conservation of energy is not violated.

thanks you two