two very small conducting spheres each of a mass of 1.0*10^-4(kg) are suspended at a common point by very thin nonconducting threads of a length 0.2(m). A charge Q is placed on each sphere> the electric force of repulsion separates the spheres, and an equilibrium is reached when the suspending threads make an angle of 10 degrees. Assuming a gravitational force of 9.80(N/kg) and a negligible mass for the threads, find Q.