An artificial satellite moves in a circular orbit around the earth. Total energy of the satellite is given by E. The potential energy of the satellite is

We know that, the potential energy of the satellite,U=-GMemReThe kinetic energy of the satellite,   K=12GMemReThe total energy,  E=U+K=-GMemRe+12GMemRe=-12GMemRe⇒  2E=-GMemRe⇒-2E=USo, potential energy =  2 (total energy)⇒ PE=2E