# Lets say I have a pipe and then another pipe inside a larger pipe.

Lets say I have a pipe and then another pipe inside a larger pipe. On the inside pipe I have an AC current I(t) and on the outer pipe I have to opposite AC current -I(t). So that when I am outside both pipes and I make my Amperian loop, the current enclosed is always zero. Now my
question is will this radiate. Between the inner and outer pipe there should be a B field because I have enclosed current and it is changing with time so there should be an induced E field. So does the inner pipe radiate. Or what radiates if anything. Any input will be much appreciated. And the pipes are infinitely long.

This doesn't radiate. It's called a coaxial cable and if you watch TV you're using it to get the signals.

I don't understand why the inside one would not radiate. If I just had one wire with AC current would that radiate?

I don't understand why the inside one would not radiate. If I just had one wire with AC current would that radiate?