(a) Find the electric potential difference VB - VA due to a point charge q1 = -2.84 nC that is 0.220 m from location A and 0.500 m from location B. (b) A charge q2 moving from B to A gains in kinetic energy. What is the sign of this charge? negative positive Additional Materials Reading /1 Points] DETAILS OSCOLPHYS2016 19.3.WA.031. Four charges of equal magnitude q = 2.09 JC are situated as shown in the diagram below. If d = 0.86 m, find the electric potential at location A due to the four charges. d - 9 -9 d A d 2d