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OpenStudy (anonymous):
a small charged pith ball is suspended 2 cm above a second charged pitch ball resting on an insulated surface. if the charge of the lower ball is +20statC and it has a mass of 25 g, what charge must be on the upper ball to lift the lower ball?
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OpenStudy (anonymous):
\[F= \frac{ q _{1} q _{2}}{r ^{2} } =mg=-25*1000= \frac{ (+20statC)(-XstatC)}{ 2^{2} }\]
OpenStudy (anonymous):
I just wonder if that so then it is at equilibrium? Isn't?
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