Four equal positive point charges, each of charge 8.9 μC , are
at the corners of a square of side 1.2 cm . What charge should be
placed at the center of the square so that all charges are at
equilibrium? Express your answer using two significant
figures.
Four equal positive point charges, each of charge 8.9 μC , are at the corners of a square of side 1.2 cm . What charge s
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