Consider two point charges located on the x axis: one charge, = -12.0 , is located at = -1.650 ; the second charge, = 31.0 , is at the origin. What is the net force exerted by these two charges on a third charge = 50.0 placed between and at = -1.220 ? Your answer may be positive or negative, depending on the direction of the force. Express your answer numerically in newtons to three significant figures. answer in N