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Physics 19 Online
OpenStudy (awesome781):

Four charges -A, B, and D - are at the corners of a square. Charges A and D, on opposite corners, have equal charge, while B and C have a charge of 1.0 C. If the force on B is zero, what is the charge on A? @timo86m

OpenStudy (anonymous):

|dw:1391225965408:dw| DIAGRAM

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