Homework Help: physics

Posted by bob on Friday, March 15, 2013 at 7:41pm.

A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the vertical as indicated, what is the net charge on the ball?

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