A current is set up in a long copper pipe is there a magnetic field a) inside b) outside the pipe?

1 Answer
Perfectly Good C.
Nov 19, 2017

b) Outside the pipe

Explanation:

The explanation being that you can separate the pipe into infinitely many wires in a tube shape.
The contributions the current of each wire makes to the inner magnetic field net out to be (in a perfect tube) 0.

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