Question: A point charge +Q is fixed at a height H above the ground. Directly below this charge is a small ball with a charge -q

A point charge +Q is fixed at a height H above the ground. Directly below this charge is a small ball with a charge -q and a mass m. When the ball is at a height h above the ground, the net force (gravitational plus electrical) acting on it is zero. Is this a stable equilibrium for the object? Explain.

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