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A point particle with known mass, m, and known positive charge, q, is placed at the...

A point particle with known mass, m, and known positive charge, q, is placed at the point (a,b) (Cartesian coordinates). The force of gravity, mg, acts downward the vertical y-direction. A second particle with unknown charge, q1, is fixed at the origin. What constant, horizontal electric field, must be applied so that the charge q will remain at rest?

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