Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.19 g and a charge of magnitude q. The balls are attracted to each other, and the threads attached to the balls make an angle of 20.0° with the vertical, as shown in the figure below.
(a) Find the magnitude of the electric force acting on each ball.
__N
(b) Find the tension in each of the threads.
__ N
(c) Find the magnitude of the charge on the balls.
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