Faraday cage in electrodynamics (with currents)

[greypilgrim]

Hi.

Assume a long hollow wire that both carries a nonzero net charge and a current. Is it still true that all charge sits on the outer surface of the cable and that the empty space inside is field-free (Faraday cage)? I know proofs of those facts in electrostatics using Gauss' theorem, but they rely on the fact that there's no electric field inside a conductor, which is not the case in general electrodynamics, for example when there's a current.

 

[cnh1995]

which is not the case in general electrodynamics, for example when there's a current.

Right. There's a small driving electric field inside a current carrying conductor because of surface charges.

the fact that there's no electric field inside a conductor, w

This is true only in electrostatic equilibrium.

 

[person_random_normal]

Yes
I think that that electric field won't be zero inside the wire ie the hollow part

 

[greypilgrim]

Most examples and experiments of Faraday cages I know appear in dynamic conditions (i.e. with currents): The inside of a car or airplane struck by lightning is save, a radio or cellphone loses reception when wrapped with aluminium foil and so on. Why do they still work under non-electrostatic conditions?