Two charged pith balls are suspended

Two charged pith balls are suspended on very light 120cm strings. Each has a mass of 10.0g. Assume the angle the threads make from the vertical is theta= 15 degrees and that the balls are in equilibrium. Draw a free body diagram for one of the pith balls and clearly label all forces with magnitude and direction. Assuming the pith balls are equally charged, what is the charge on each ball? (This is not a qualitative prediction; a numerical answer must be obtained.) Please show all work. I am lost on how to do the problem

Answer

Draw the following free body diagram for the right ball from given data. 0 T sin θ Here, / is the length of the string, 2r isThe net force on the ball in vertical direction is equal to zero. ly T cos e mg Take the ratio of above two equations FE=mg t

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