A point charge q2 = -0.5 μC is fixed at the origin of a co-ordinate system as shown. Another point charge q1 = 3.5 μC is is initially located at point P, a distance d1 = 8.8 cm from the origin along the x-axis

1) What is ΔPE, the change in potenial energy of charge q1 when it is moved from point P to point R, located a distance d2 = 3.5 cm from the origin along the x-axis as shown?