Shown in the figure below is a device used to detect charge placed on a small ball. The violet ball, has known charge Q = 6.8e-08 Coulombs and is fixed in place. The blue ball (m = 0.00115 kg) is suspended by a string of length L = 0.111 meters. At the moment shown in the figure, the blue ball hangs at an angle ? = 13.8 degrees off the vertical.