BrdEdt=µε002, and for r ≥R, it is BRrdEdt=22. The maximum magnetic field occurs at points for which r = R, and its value is given by either of the formulas above: BRdEdtmax.=2There are two values of rfor which B = Bmax/2: one less than Rand one greater. (a) To find the one that is less than R, we solve 24dtdt=for r. The result is r = R/2 = (55.0 mm)/2 = 27.5 mm. (b) To find the one that is greater than
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