Two identical balls fit snugly in a vertical cylinder that is open at the top. E

Question

Two identical balls fit snugly in a vertical cylinder that is open at the top. Each ball has a mass of 13.0 g: a radius of 3.00 cm: and each carries a charge of +0.450 mu C. There is no leakage of charge between the balls and the cylinder. Initially, the top ball is pressed down and held firmly against the bottom ball. Neglecting friction, what is the maximum height, measured from the bottom of the cylinder, that the center of the top ball reaches after it is let go?

Explanation / Answer

mgh=kq1q2/R^2 =====> h=kq1q2/mgR^2 =9e9*0.45e-6*0.45e-6/(13e-3*9.8*0.06*0.06) ====> h=4.09m

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