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Physics 20 Online
OpenStudy (anonymous):

You are given two unknown point charges, Q1, and Q2. At a point on the line joining them, one third of the way from Q1 to Q2 the electric field is zero. What can you say about these two charges?

OpenStudy (mos1635):

|dw:1336326088186:dw| they are both (+) or (-)

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