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What must the value of q3 be for the net force on this point charge to...

What must the value of q3 be for the net force on this point charge to have magnitude 3.70 μN ?Constants Three point charges are arranged along the x axis. Charge q1 = -4.10 nC is located at x= 0.220 m and charge q2 = 2.10 nC is at x= -0.320 m . A positive point charge q3 is located at the origin. Where along the x axis can q3 be placed and the net force on it be zero, other than the trivial answers of x=+∞ and x=−∞?

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