Two electrons and one proton are arranged as shown below. We like to determine the net, also known as the resultant electrostatic force on the upper electron that is sittated on the $x-$axis.

it is measured that a force of $4N$ is exerted on this electron by the proton. Also shown is a force vector scate for a force of $1N.$ approximately the length of the grid sides. $($a$)$ Draw a nice vector diagram to show the resultant force? $($b$)$ Calculate the resultant force vector.