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how would I go about calculating the B field of a bar magnet?

I've already managed to calculate the electric field between two charged particles etc and draw that, but I just can't see where to start with this one as its not just a point at north and south but a whole load of atoms working together.

If anyone could point me to some equations that would be good or just provide some ideas about where to start...

(btw this is not a hw q, just something I was wondering)

thank you!

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# Permanent magnet B field equation

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