Two protons are placed at a = 4.69 cm above and below the x axis at x = 0 as shown in the figure. An electron is placed along the x axis a distance b = 10.1 cm from the origin.
a) Determine the magnitude of the electrostatic force on the electron.
b) Determine the direction of the net electrostatic force on the electron (angle with respect to the positive x-axis) r=sqrt(a^2+b^2) converting a and b to meters then shouldnt the answer for a = (kq^2)/r^2