A positive charge of q 540 uc is fixed in place from a, Ask an Expert

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A positive charge of Q = 5.40 uC is fixed in place. From a distance of ri = 4.20 cm a particle of mass m = 5.50 g and charge q = +4.00 uC is fired with an initial speed of v = 68.0 m/s directly toward the fixed charge. What is the minumum distance rf between the two charges?

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