Suppose a wire is bent in a loop...

Question

If a wire is bent into a loop, would the magnetic field be stronger inside or outside the loop?Or nowhere near the loop?

Answer 1

The B-field of a wire carrying a current drops off like one over the distance to the wire.  So the strongest magnetic field will be right up against the wire.  It will be slightly stronger inside because the B-fields from wires on opposite sides will add constructively.  If the wire is thin compared to the dimensions of the loop, though, it doesn't matter much.  The B-field near the wire won't notice the current on the other side anyway.