A small metal sphere, carrying a net charge of q1 = 2.80 µC, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q2 = -7.80 µC and mass 1.50 g, is projected toward q1. When the two spheres are 0.800 m apart, q2 is moving toward q1 with speed 22.0 m/s (Fig). Assume that the two spheres can be treated as point charges. You can ignore the force of gravity.
(a) What is the speed of q2 when the spheres are 0.400 m apart?
(b) How close does q2 get to q1?


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March 26, 2010

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