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Unformatted text preview: 66. The two closest charges produce fields at the midpoint which cancel each other out. Thus, the only significant contribution is from the furthest charge, which is a distance r = 3d / 2 away from that midpoint. Plugging this into Eq. 22-3 immediately gives the result: Q Q 4Q . E= = = 2 2 4πε 0 r 3 4πε 0 d 2 4πε 0 ( 3d / 2) ...
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- Fall '10