Apoint charge q2 = -3.8 μc is fixed at the origin of a co-ordinate system as shown. another point charge q1 = 1.7 μc is is initially located at point p, a distance d1 = 8.5 cm from the origin along the x-axis

the charge q2 is now replaced by two charges q3 and q4 which each have a magnitude of -1.9 μc, half of that of q2. the charges are located a distance a = 2 cm from the oringin along the y-axis as shown. what is δpe, the change in potential energy now if charge q1 is moved from point p to point r?