7) A small spherical insulator of mass 1.79 x 10* kg and charge 0.6 JC hangs at the end of a thin wire of negligible mass. A charge of -0.90 uC is held 0.15 m away and to the right of the sphere, so the wire 0.150 m makes and angle 0 with the vertical as shown. +0.600 JC -0.900 JC Calculate the angle 0. A B C D E 55.90 54.20 50.90 52.50 57.80