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Unformatted text preview: 51. The point at which we are evaluating the net ﬁeld is denoted by P . The contributions to the net ﬁeld
caused by the two electrons nearest P (the two electrons on the side of the triangle shared by P ) are
seen to cancel, so that we only need to compute the ﬁeld (using Eq. 233) caused by the electron at the
far corner, at a distance r = 0.17 m from P . Using 1/4πε0 = k , we obtain
Enet = k e
= 4.8 × 10−8 N/C .
r2 ...
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 Fall '08
 SPRUNGER
 Physics

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