A point charge q1=4.00nC is placed at the origin, and a second point charge q2= -3.00nC is placed on the x-axis at x= 20.00 cm. A third point charge q3=2.00 nC is to be placed on the x-axis between q1 and q2. A.) What is the potential energy of the third charge if it is placed at x= 10.00cm. B) Where should the third charge be place to make it's potential energy 0?