**27. ssmA small spherical insulator of
mass 8.00 x 10-2 kg and charge +0.600 µC is hung by a thread of
negligible mass. A charge of -0.900 µC is held 0.150 m away from the sphere and directly to
the right of it, so the thread makes an angle q with the vertical (see the drawing). Find (a)
the angle q and (b) the tension in the thread.