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Two small plastic balls hang from threads of negligible mass. Each ball has a mass of...

Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.14 g and a charge of magnitude q. The balls are attracted to each other, so that the threads hang (at equilibrium) at an angle of 20.0 degrees relative to vertical.

a)Refer to the previous question. What is the magnitude of the electrostatic force between the two charges?

b)Refer to the previous question. What is the magnitude of the charge q?

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