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Interactive LearningWare 18.1 offers some perspective on this problem. Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 2.0×10–6 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. (a) What algebraic signs can the charges have? (b) Determine the charge magnitude.
Hint:
Recall that the gravitational force between two masses is attractive and given by
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