ch24-p112 - 112. (a) The total electric potential energy...

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112. (a) The total electric potential energy consists of three equal terms: U = q 1 q 2 4 πε o r + q 2 q 3 4 πε o r + q 1 q 3 4 πε o r where q 1 = q 2 = q 3 = q = e 3 , and 15 2.82 10 m r as given in the problem. The result is () ( ) 2 92 2 1 9 2 14 15 0 3 8.99 10 N m C 1.60 10 C/3 3 2.72 10 J 4 2.82 10 m q U r πε ×⋅ × == = × ×
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