Determine the magnitude & direction of the electric field at points A & B due to 2 positive charges?

Question

Use Coulomb's law to determine the magnitude and direction. Q=7.0 C and from +Q to point A is 10.0cm from point A to point B is 5.0 cm and from point B to +Q is 5.0 cm. The height from point A to +Q is 5.0 cm.

Answer 1

steps
1 Write down Coulombs law and calculate the electric field vector for each charge at point A . The vector is in the direction of a line connecting the charge and the point.
2 Resolve the field vector from each charge into its x and y components.
3 Add the x components to find the resultant field in the x direction and then the y components to find field in y direction