The drawing shows a positive point charge q1, a second
Chapter 18, Problem 19.72(choose chapter or problem)
The drawing shows a positive point charge q1, a second point charge q2 that may be positive or negative, and a spot labeled P, all on the same straight line. The distance d between the two charges is the same as the distance between q1 and the spot P. With q2 present, the magnitude of the net electric field at P is twice what it is when q1 is present alone. Given that q1 0.50 C, determine q2 when it is (a) positive and (b) negative. *
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