ch29-p059 - 59. (a) The magnitude of the magnetic dipole...

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59. (a) The magnitude of the magnetic dipole moment is given by µ = NiA , where N is the number of turns, i is the current, and A is the area. We use A = π R 2 , where R is the radius. Thus, == = Ni R ππ 2 2 2 300 4 0 0 025 2 4 b gb g b g .. . . Am A m (b) The magnetic field on the axis of a magnetic dipole, a distance
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