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8. A negative point charge of magnitude q is placed on the positive y axis at a distance of +a. A positive point charge is placed on the negative y axis at a distance of-a. A third positive charge (a test charge) of the same magnitude q is placed somewhere on the positive x axis. a) What is the magnitude and direction of the third charge if x- 0? b) What is the force on the charge when it is at position x? c) Sketch a (rough) graph of the force s a function of position for x betweern +4a and-4a.
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