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Introductory Physics Homework Help
Magnitude of a Point Charge on a Line
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[QUOTE="theintarnets, post: 4490096, member: 388751"] [h2]Homework Statement [/h2] 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 = +1.19 µC, determine the magnitude |q2| when q2 is positive. Determine the magnitude |q2| when q2 is negative. [ATTACH=full]163677[/ATTACH] [h2]Homework Equations[/h2] Actually my problem is I don't know which equation I'm supposed to use. All I know is that E = kq/r[SUP]2[/SUP] [h2]The Attempt at a Solution[/h2] I tried making an equation, given that the net field at P is twice what q1 is alone. So I would then have something like: 2(kq/r[SUP]2[/SUP]) = kqQ/2r[SUP]2[/SUP] I'm not sure if that's right though. I would just get 4 as an answer. And then I have no idea what to do about -q2... [/QUOTE]
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Magnitude of a Point Charge on a Line
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