An electron is released a short distance above earth's surface. A 2ndelectron directly below it excerts an electrostatic force on the 1st electron just great enough to cancel the gravitational force on it How far below the 1st electron is the 2nd?

How many electrons must be removed from each two of 5.81kg copper spheres to make the electric force of repulsion between them equal to the magnitude to the gravitational attraction between them?

Two point charges are separated by a distance r and repel each other with a force F. If
their separation is reduced to 0.293 times the original value, what is the magnitude of
the force of repulsion between them?

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