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PHYSICS 4B Chapter 23 23.3 A small metal sphere, carrying a net charge of q 1 = -2.80 μ C, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q 2 = -7.80 μ C and mass 1.50 g, is projected toward q 1 . When the two spheres are 0.800 m apart, q 2 is moving toward q 1 with speed 22.0 m/s (Fig. 23.28). Assume that the two spheres can be treated as point charges. You can ignore the force of gravity. a) What is the speed of q 2 when the spheres are 0.400 m apart? b) How close does q 2 get to q 1 ? Fig. 23.28 23.6 Three equal 1.20- μ C point charges are placed at the corners of an equilateral triangle whose sides are 0.500 m. What is the potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.) 23.16 A particle with a charge of +4.20 nC is in a uniform electric field E directed to the left. It is released from rest and moves to the left; after it has moved 6.00 cm, its
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