P25_069.PDF

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Chapter 25 - 25.69
69. Since the charge distribution on the arc is equidistant from the point where V is evaluated, its contri-
bution is identical to that of a point charge at that distance. We assume V
→
0as r
→∞
and apply
Eq. 25-27:
1
4 πε 0
+ Q
R
1
4 πε 0
+4 Q
2 R
4 πε 0 −
2 Q
R
V =
+
+
which simplifies to Q/ 4 πε 0 R .
1
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