A point charge Q1 is held stationary at the origin. A secondcharge Q2 is placed at point "a", and the electric potential energyof the pair of charges is +5.4*10^-8 J. When the second charge ismoved to point "b", the electric force on the charge does
-1.9*10^-8 J of work.
What is the electric potential energy of the pair of chargeswhen the second charge is at point "b"?