A) Four charges Acˆ’4 Af— 10Acˆ’9 C at (0 m, 0 m), Acˆ’4 Af— 10Acˆ’9 C at (1 m, Acˆ’2 m), 7 Af— 10Acˆ’9 C at (Acˆ’4 m, Acˆ’4 m), and Acˆ’8 Af— 10Acˆ’9 C at (1 m, 3 m), are arranged in the (x, y) plane as shown. Find the magnitude of the resulting force on the Acˆ’4 nC charge at the origin. The Coulomb constant is 8.98755 Af— 109 N A?· m2/C2. Answer in units of N. B) What angle does the resultant force on the Acˆ’4 nC charge at the origin make with the positive x axis? Quadrant I lies between 0Ac—¦ and 90Ac—¦, quadrant II between between 90Ac—¦ and 180Ac—¦, etc.