Three identical point charges, each of mass m 0.10kg and charge q, hang from three strings, as pictured below. The lengths of the left and right strings are L 30.0cm and the angle is 45.0o. Just on looking at the picture I think the charge is positive since there is tension separation the three masses. I'm confused on how to get q. Should I be looking at the space separating the masses on the x-axis? or be more focused on gravity's role?