Solve the all parts of given problem:
Problem: A -10nc charge is located at the origin.
Part I: What is the strength of the electric field at the position (x,y) = (-5.0cm, -5.0cm).
Part II: what is the strength of the electric field at the position (x,y) = (-5.0cm, 5.0cm).
Please use great detail in explaining the solution. Thanks.