Consider the figure below. Find the total Coulomb force on a charge of 2.8 nC located at x = 2.7 cm in part (b) of the figure, given that q = 7.4 µC. (Indicate the direction with the sign of your answer.)___ NFind the x-position (between x = 0 cm and x = 14 cm) at which the electric field is zero in part (b) of the figure.___ cm