Four identical point charges are placed at the corners of a square, A fifth point charge placed at the center of the square experiences zero net force . Is this a stable equilirium for the fifth charge? Explain.

Four identical point charges are placed at the corners of a square, A

1.	Four identical point charges are placed at the corners of a square, A fifth point charge placed at the center of the square experiences zero net force . Is this a stable equilirium for the fifth charge? Explain.
Answer» No, Only for very special displacements, the electrostatic force acts in a direction that points back toward the equilibrium position. For a general displacment, the electrostatic force does not point toward the equilibrium position, and the fifth charge moves farther from equilibrium, making the system unstable.

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Four identical point charges are placed at the corners of a square, A fifth point charge placed at the center of the square experiences zero net force . Is this a stable equilirium for the fifth charge? Explain.

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