You were to take a hollow metal sphere and cut it in half to make 2 pieces. You then take your 2 hemispheres and magnetize them such that the inside of each 'bowl' is North and the outside is South. You then jam them back together. (maybe thread the edges). The N pole is trapped on the inside and the outside is all S. Physics says such a thing can't be, but there's nothing to prevent you from doing the above, so what would happen?
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