1. The problem statement, all variables and given/known data http://loncapa.vcu.edu/res/vcu/phys202/zzImages/two-charges-forces.bmp Problem#1: Two identical conducting balls, A and B, of identical masses m = 10 kg, are suspended in equilibrium by insulating massless strings in length L = 3 m. Both balls make the same angle θ = 30° with the vertical axis. Both masses have equal charge. You can ignore the size of the balls. What is the magnitude of the Coulomb force, i.e. electric force, exerted on A from B due to the charges? (From free body diagram analysis) What is the amount of charges (do not worry it is positive charge or negative charge) on each ball? Problem#2: Two identical conducting balls, A and B, of identical masses m = 40 kg, are suspended in equilibrium by insulating massless strings in length L = 2 m. Both balls make the same angle θ with the vertical axis. The angles are very small such that small angle approximation applies (i.e. tan θ = sin θ). Both masses have equal charge Q= 3e-06 C. You can ignore the size of the balls. What is the distance r between the two balls? 2. Relevant equations F=q1*q2*k/(r^2) where k=9*10^9 E=F/Q 3. The attempt at a solution the only part i figured out (sadly) is the 1st part to find the Coulomb force. and that was only because the teacher gave us the equation :( ((40kg*10)/cos(30))*sin(30)=i got 57.7N for coulomb force still don't no why thats the answer, but at least i no how to get it. but i don't know what to do from here. i don't know how to find r so i assume it is L given (=3m). so i don't know how to find q (amt of charges). for problem#2 i am stumped. i don't understand angle approximation and i can't use the cos/sin method that our teacher gave us. so wat do i do??