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Unformatted text preview: q as it is from +q 2 r 43 d $ r q X=0 ( d-r $ -2q X=d 3 x Setting U = 0 1 r 2 d r 2r d r r d 3 46 Makes Sense! Q is twice as far from -2q as it is from +q For a pair of charges: Just evaluate U q1q2 k r r q1 q2 (We usually choose U = 0 to be where the charges are far apart) For a collection of charges: Sum up U q1q2 k r for all pairs...
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This document was uploaded on 03/08/2012.

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