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 -LRB- a -RRB- the field point at x = 0 , y = -1.35 m ; -LRB- b -RRB- the field point at x = 12cm , y-12cm ; -LRB- c -RRB- the field point at x = -1.10 m , y = 2.60 m ?
Which point on the curve 4 * x ^ 2 + a ^ 2 * y ^ 2 = 4 * a ^ 2 , 4 < a ^ 2 < 8 is farthest from the point -LRB- 0,-2 -RRB- ?