A charge of -2.9 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.110 m. The charges on the circle are +4.55 µC at the position due east and -3.6 µC at the position due north. What are the direction and magnitude of the net electrostatic force acting on the charge at the center? Specify the direction relative to due east.