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The magnetization inside iron is has a magnitude such that $\mu_0 M \approx 10^{-1}$ tesla (.  What is the effective current density on the surface of a long, cylindrical iron magnet?
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current density = amperes/area

But 1 Tesla is given by formula below,which denotes that on a 1 meter long electrical conductor, which in turn conducts a current of 1 ampere, exactly 1 Newton attraction.

Therefore = 10^-1 effective current density.

by Diamond (44,656 points)

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