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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 = 0.796 g, q = 2.54 μC is located on the x axis at x = 18.4 cm, moving with a speed of 46.3 m/s in the positive y direction. For what value of Q will the moving particle execute circular motion? (Neglect the gravitational force on the particle.)

Answer is in micro-coulomb.

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