Solve the following problem:
Q: Two equal, positive charges, q = 2.0 micro Coulomb ; are located on the x-axis- one at +0.3m and the other at -0.3m. A third charge Q = +4.0 micro Coulomb is located on the y-axis at +0.4m
1) Find the magnitude & direction of the resultant (net) force on Q.
2) Find the electric field and potential at the point (0.0, -0.4m)