Physics Homework Questions: A point charge is at the origin. With this point charge as the source point, what is the unit vector in the direction of (a) the field point at x=0, y=-1.35m; (b) the field point at x=12cm, y-12cm; (c) the field point at x=-1.10m, y= 2.60m? Which point on the curve 4*x^2+a^2* y^2= 4*a^2, 4<a^2<8 is farthest from the point (0,-2)?