There is a 85 uC point charge at the origin. What is the electric field at the point x= -45cm , y= 55cm. I am doing (-.45+.55)/(-.45^2+.55^2)^3/2

Question

There is a 85 uC point charge  at the origin. What is the electric field at the point  x= -45cm ,  y= 55cm. I am doing (-.45+.55)/(-.45^2+.55^2)^3/2

Where did I go wrong?

I have to find the elctric point for the Ex and Ey.

drwls · Answer

I understand where the (-.45^2+.55^2)^3/2 term comes from, but I don't see the Coulomb constant in your equation. In the numerator, you should have a vector with x and y components, but you are not using a vector notation. You need to show units also (preferably Coulombs and meters if you want the answer in Newtons/Coulomb)