Three positive charges are arranged as shown. 1.0 nC 7.0 nC -0.10 m- 9.0 nC 0.10 m Find the magnitude of the electric field at the fourth corner of the rectangle. The Couloumb constant is 8.99 109 N m/C. Answer in units of N/C. 017 (part 2 of 2) 10.0 points What is the direction of this electric field (as an angle between -180 and 180 measured from the positive x-axis, with counterclock- wise positive)? Answer in units of.