Acharge located at (3,-5) in the x-y plane exerts an attractive force of 0.75n on another charge located at (2,7) (all distances are in cm) a) in what direction does this force point? the answer should be given as a counterclockwise angle with respect to the positive x-axis. b) write down an expression for this force in terms of unit vectors i and (don't forget your units). c) if the charge at (3,-5) is +2pic, determine the magnitude and sign of the other charge.