pls let me know asap, i am in hurry :( 1.

The gure shows four identical conducting spheres that are actually well separated from one another. Sphere W (with an initial charge of zero) is touched to sphere A and then they are separated. Next, sphere W is touched to sphere B (with an initial charge of -26e) and then they are separated. Finally, sphere W is touched to sphere C (with an initial charge of 52e), and then they are separated. The nal charge on sphere W is 20e. What multiple of e gives the initial charge on sphere A? A0 BO CO W0 A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.909 g, q = 5.36 JC) is located on the x axis at x = 15.3 cm, moving with a speed of 43.0 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.)