81. The net potential at point P(the place where we are to place the third electron) due to the fixed charges is computed using Eq. 24-27 (which assumes V→0 as r→∞): 0002444PeeeVdddπεπε−−=+=−. Thus, with d= 2.00 ×10−6m and e= 1.60 ×10−19C, we find 922
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