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Three charged particles are placed at each of three corner of an equilateral triangle whose sides are of length 2.5 c.m. Two of the particles have a negative charge: q1=-7.8nC and q2=-15.6 nC. The remaining particle has a positive charge, q3=8.0nC. What is the net electric force acting on particle 3 due to particle 1 and particle 2?

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