Question

Two positive charges q_{1} = q_{2} = 2.0 {\rm \mu C} are located at x = 0, y = 0.30 {\rm m} and x = 0, y = -0.30 {\rm m}, respectively. Third point charge Q = 4.0 {\rm \mu C} is located at x = 0.40 {\rm m}, y = 0.What is the net force ((a)magnitude and (b)direction) on charge q_{1} exerted by the other two charges?

Answer 1

third point charge is positive or negative? unit of charge is coulomb why it is appearing as {\rm \mu C} ?
force experienced by q1 due to Q and q2 can be calculated using coulomb's law, where you have to consider the distance between charge q1 and Q and distance between q1 and q2.