2. At t = 0, the switch is closed and we assume that there is no charge on the parallel-plate capacitor. The plates of the capacitor are circular and Iheir radii are b,
申論題內容
(e) Find the expression for B(r) = ? at a point outside the capacitor at radius r from the center, when Ihe capacitor is being charged. (r ＞ b)
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