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Two identical objects each hold a net charge of q = 8e. If the gravitational force between the two objects exactly cancels the electrostatic force between the objects, what is the mass of each object?
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Added Thu, 27 Aug '15
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gravitational force = electrostatic force
Gmm/R^2 = Kq.q/R^2
m^2 = Kq^2/G = 9x10^9*64x1.6x1.6x10^-38/(6.67x10^-11)
m =14.86 x10^-9 kg
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