You are on vacation in an alternate universe where nearly all the laws of physics are the same as in your home universe, but you notice that the charge on an electron in the alternate universe is -0.9999e and the charge on a proton is +e. Consider now two spheres of copper, each with mass 1.0 kg. (a) What is the total charge on one of the spheres? (b) What is the electric force between the two spheres when they are separated by a distance of 0.50 m? Is this force attractive or repulsive? (c) Compare the magnitude of the electric force with the magnitude of the gravitational force between the two spheres.
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