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5. Two point charges Qr1 +4 and -q are fixed in place a distance 2a apart as shown in the diagram below. A positive test charge go is placed a distance x away along the perpendicular bisector. (a) Derive a symbolic expression for the magnitude and direction of the electrostatic force on the test charge. (b) Show that your symbolic expression reduces to a sensible result when x0 TEST CHARGE
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