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Two charges, q1 = 5 μC and q2 = 7 μC, are separated by 25 cm....

Two charges, q1 = 5 μC and q2 = 7 μC, are separated by 25 cm. Where should a third charge be placed on the line between them such that the resultant force on it will be zero? Does it matter if the third charge is positive or negative?

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