A particle of charge Q is fixed at the origin of anxy coordinate system. At t = 0 a particle(m = 0.776 g, q = 5.04 µC is located on thex axis at x = 18.7 cm, moving with a speed of39.8 m/s in the positive y direction. For what value ofQ (in μC) will the moving particle execute circularmotion? (Neglect the gravitational force on the particle.)