1. This question is about Coulomb's law, and how to find the force on one charge in the presence of other charges. Consider three point charges are placed at the following points on the x axis: $q_1 = +2 \mu C$ at $x = 0$, $q_2 = -3 \mu C$ at $x = 40 cm$, and $q_3 = -5 \mu C$ at $x = 120 cm$.
(a) State the size of force on the $-3 \mu C$ charge, and the direction.
(b) State the size of force on the $-5 \mu C$ charge, and the direction.