ch21-p014 - 14. (a) According to the graph, when q3 is very...

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14. (a) According to the graph, when q 3 is very close to q 1 (at which point we can consider the force exerted by particle 1 on 3 to dominate) there is a (large) force in the positive x direction. This is a repulsive force, then, so we conclude q 1 has the same sign as q 3 . Thus, q 3 is a positive-valued charge. (b) Since the graph crosses zero and particle 3 is between the others, q 1 must have the
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