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## Main Question or Discussion Point

If you hold a bar magnet in the middle of an empty volume and put a gauss meter in front of a pole, there is evidently a measurable magnetic flux, so there is a magnetic circuit there.

What is the reluctance of the whole circuit, not counting the bar magnet itself? How do you work that out? Is it 'infinite' because the circuit is free to roam across empty space, or are there constrains on that, and how it is calculated?

Not a homework question, it's to address an engineering design question, so this is a question 'in practice'. Thanks.

What is the reluctance of the whole circuit, not counting the bar magnet itself? How do you work that out? Is it 'infinite' because the circuit is free to roam across empty space, or are there constrains on that, and how it is calculated?

Not a homework question, it's to address an engineering design question, so this is a question 'in practice'. Thanks.