1. The two small plastic spheres shown in Fig. 2.12 are arranged so that they can slide freely along the insulating fiber. Each has a mass of 0.1 g. The spheres are given identical positive charges. (a) If the lower sphere is resting against the lower knot while the upper sphere moves to a location 6 cm distant from that knot, find the charge on each. (b) If the charges remain the same, what angle should the fiber make with the horizontal to double the separation?
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