Two particles are fixed on an x axis. Particle 1 of charge 60.5 µC is located at x = -18.7 cm; particle 2 of charge Q is located at x = 9.53 cm. Particle 3 of charge magnitude 51.7 µC is released from rest on the y axis at y = 27.4 cm. What is the value of Q if the initial acceleration of particle 3 is in the positive direction of (a) the x axis and (b) the y axis?