A single loop of wire with area A carrying a current I has a magnetic moment µ = IA. If you wanted a single loop of wire with an area equal to the cross-sectional area of the magnet used here to have the same magnetic moment as your permanent magnet, how large a current would you need flowing through the loop?
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A single loop of wire with area A carrying a current I has a magnetic moment µ = IA. If you wanted a...
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