ch24_p42 - 42. Let r = 1.5 m, x = 3.0 m, q1 = 9.0 nC, and...

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42. Let r = 1.5 m, x = 3.0 m, q 1 = –9.0 nC, and q 2 = –6.0 pC. The work done by an external agent is given by WU qq r rx == + F H G I K J =− × − × × F H G I K J ⋅− + L N M M O Q P P −−
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