59. (a) The magnitude of the magnetic dipole moment is given by µ= NiA, where Nis the number of turns, iis the current, and Ais the area. We use A = πR2, where Ris the radius. Thus, ===⋅Ni Rππ222300 4 00 0252 4bgbgbg....AmAm(b) The magnetic field on the axis of a magnetic dipole, a distance
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