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On 2021/May/05, at 11:51, Carl Mungan via Phys-l <firstname.lastname@example.org> wrote:
Okay, that’s helpful. So how about if instead of a bar, I use a square donut so field lines can loop around through it so they never have to pass through air?
This might be easier if I use iron wire, initially long pieces passing through the core, but now I bend the free ends to join them together.