A Does a DC supplied superconductive coil give off radiation?

[binis]

The drift velocity is more around ~1mm/s.

I read that drift velocity in superconductors is about 20 meters per second.

 

[Vanadium 50]

No.

For the third time, the A-level answer is radiation is caused by time-varying multipoles and these are zero for DC.

 

[artis]

@hutchphd I think the cyclotron analogy is not usable here because in a coiled wire with steady current the actual electrons move slowly , very slowly so from the standpoint of a single electron the curled wire seems almost straight at the speed it is going. Much like we don't see and don't feel the curve we are actually making while traveling along a long road even though the Earth is curved and we are traveling along a curved path.

In cyclotrons on the other hand you have a relativistic electron beam being deflected by a perpendicular B field. But I have another example that i myself would like to ask, for steady DC current doesn't it also matter in what type of "conductor" the current is flowing? It seems to me a toroidal plasma does emit cyclotron radiation with a steady current, I suspect this has something to do with the confining fields which are present for a plasma and not present for a solid copper wire with DC.