A Does a DC supplied wavy superconductor give off EM radiation?

[binis]

A superconductor has the shape of a uniform plane wave. If it is flowed by a direct current,
is it emitting electromagnetic radiation or not?

 

[Baluncore]

When the current is initiated, a magnetic field is radiated due to the turn-on transient.

A continuous direct current maintains a stable magnetic field, being the vector sum of all the magnetic fields from all the segments of the circuit.

When the current is terminated, the radiated magnetic field will fall back to zero.

 

[binis]

There is radiation power due to the accelerated charges, have a look to this post https://www.physicsforums.com/threa...-coil-give-off-radiation.1010740/post-6585560

 

[Dale]

If it is flowed by a direct current,
is it emitting electromagnetic radiation or not?

No. The shape of the loop is irrelevant. When it is DC there is no radiation.

have a look to this post

Have a look at the rest of that thread. The post you mention was subsequently corrected, and since you participated there you are already aware.

What produces radiation is a changing dipole moment (or higher-order multipole). A single accelerating charge does not produce radiation because of acceleration. It produces radiation because of a changing dipole moment.

A DC current has no changing moments, so no radiation, regardless of the shape of the loop.