4 Part A Use Coulomb's law to determine the magnitude of the electric field at points A and B in the figure due to the two positive charges B A X a a a 2a(Q = 5.8 \"C , a = 4.0 cm) shown. Express your answers using two signicant gures separated by a comma. Previous Answers Request Answer 7 Part B Use Coulomb's law to determine the direction of the electric eld at points A and B Express your answers using two signicant gures separated by a comma. Previous Answers Request