ch24-p020 - 20. When the charge q2 is infinitely far away,...

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V 1 = 1 0 4 q d πε = 5.76 × 10 7 V. Thus, q 1 / d = 6.41 × 10 17 C/m. Next, we note that when q 2 is located at x = 0.080 m, the net potential vanishes ( V 1 + V 2 = 0). Therefore, 21 0 0.08 m kq kq d =+ Thus, we find q 2 = 1 ( / )(0.08 m)
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