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2) Point charge Qs is at the origin. Point charge Q2 is atx L, and point charge Qs is at x3L. The net force on each individual charge is zero. Do charges 1 and 2 have the same charge sign or the opposite sign? Be sure to justify you answer, and also justify if you claim that the answer cannot be found. A solution to #4 does not count as justification; the point is to be able to check that answer.
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Answer #1

Charges 1 and 2 have opposite signs.

Its given that the net force on each charge is 0, so the net force on 3 is zero. For this, the direction of force on 3 sue to 2 must be opposite to that due to 1. This is possible only when the charges 1 and 2 are of opposite signs.

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