Calculate the electric field of a point charge
Point charges of -10 µC, 1.0 µC, and +10 µC are located along the x axis at x = -1.0 cm, x = 0, and x = +1.0 cm, respectively. Calculate the electric field at x = 3.0 cm.
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A third charge of +3q is located on the x axis at such a place that the net electrostatic force on the charge at the origin triples, its direction remaining unchanged. Where should the third charge be located?
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