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[" LOMB'S LAW "],[" Five balls,numbered ...

[" LOMB'S LAW "],[" Five balls,numbered "1" to "5" ,are suspended using separate threads.Pairs "(1,2),(2,4),(4,1)],[" show electrostatic attraction,while pairs "(2,3)" and "(4,5)" show repulsion,therefore ball "1" must "],[" show electrostatic attraction,while pairs "(2,3)" and "(4,5)" show repulsion,therefore ball "1" must "],[" be: "],[[" (A) Positively charged "," (B) Negatively charged ",," () "]]

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