two tiny conducting spheres are identical. one sphere (q1 = +1.0 x 10^-7 C) hangs at the end of a 60.0 cm long thread that is attached to the ceiling at point A. The second sphere (q2 = +2.0 x 10^-7 C) is held in place, directly beneath point A, at the same height as q1. it causes q1 to deflect 10.6 cm from the vertical as shown. Calculate the mass of sphere, q1.