1. The problem statement, all variables and given/known data A charged cork ball of mass m is suspended on a light string in the presence of a uniform electric field, as shown in the figure below. When E = (A + B) N/C, where A and B are positive numbers, the ball is in equilibrium at the angle θ. (a) Find the charge on the ball. (Use any variable or symbol stated above along with the following as necessary: g for the acceleration due to gravity.) (b) Find the tension in the string. (Use any variable or symbol stated above along with the following as necessary: g for the acceleration due to gravity.) 2. Relevant equations 3. The attempt at a solution Found horizontal force equation (Fx =(q x E ihat) - Tsin(theta)) and vertical force equation (Fy = Tcos(theta) +(q x E jhat) - mg = 0) and manipulated and subsituted to get q = mg / (A ihat x cot(theta) + B jhat). I pretty positive this is right and I'm not sure why my program is saying it isn't. The second part I tried adding the two tension vectors, but did not get it correct. I did ((q x E x ihat) / sin theta) +((mg - q x E jhat) / cos theta).