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A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.934 g, q = 3.72 µC is located on the x axis at x = 22.8 cm, moving with a speed of 59.3 m/s in the positive y direction. For what value of Q (in µC) will the moving particle execute circular motion? (Neglect the gravitational force on the particle.)

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