Strength of Electric Field with a point charge

[ltruiz45]

Problem:
A +11 nC charge is located at the origin.

Question:
What is the strength of the electric field at the position x,y (-5cm, 5cm) ?


I would think you would do this but when I try it I get the wrong answer

for x-axis - E=k|q|/r2
For y-axis - E=k|q|/r2

Then $\sqrt{}Ex^2 + Ey^2$

 

[Redbelly98]

Problem:
A 11 charge is located at the origin.

What is "a 11 charge"?

Question:
What is the strength of the electric field at the position ?

At what position?

I would think you would do this but when I try it I get the wrong answer

for x-axis - E=k|q|/r2
For y-axis - E=k|q|/r2

Then $\sqrt{}Ex^2 + Ey^2$