73. Four equal positive point charges, each of charge
Chapter 16, Problem 73(choose chapter or problem)
73. Four equal positive point charges, each of charge 8.0/xC, are at the corners of a square of side 9.2 cm. What charge should be placed at the center of the square so that all charges are at equilibrium? Is this a stable or unstable equilibrium (Section 9-4) in the plane?
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