Question: 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

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 = 10.50 µC, determine q2 when it is (a) positive and (b) negative.

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