Let** l** be the length of a string, 2r to be the separation between the balls, **m** be the mass of the ball, **T** be tension, and **F _{E} **be the electrostatic force.

Two charged pith balls are suspended on very light 120cm strings.Each has a mass of 10g. Assume the angle the threads make from the vertical is 10degrees 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?(a numerical answer must be obtained)

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