Objects A and B are both positively charged. Both have a mass of 100 g but A has twice the charge of B. When A and B are placed with 10 cm between their centers, B experiences an electric force of 0.35 N What is the charge of qa? I have no idea where to start... I know of the equation.. F = k|q*q'|/r^2 but this does not relate to mass in any way... so how am I suppose to implement the 100g into the equation to solve for qa?