Three different loads are fixed in a straight line on (or parallel
to) the x axis, and they are 32.3 cm apart. The charge on the left
end is Q1 = -2.3µC, the one in the middle is Q2 = + 43.7µC, and the
one on the right is Q3 = + 72.6µC. What will be the magnitude and
direction of the electric force felt by the charge on the right Q3
of 72.6µC?