Consider two insulating spheres onto which charge is placed. On a given sphere, the charge is distributed uniformly on the surface. The radius and charge of sphere 1 are R1=1.1 cm and Q1=0.8 ?C, and the radius and charge of sphere 2 are R2=0.011 cm and Q2=-0.056 ?C. The spheres are separated by a distance r=1.32 cm. What is the electrostatic potential energy of this configuration?