Exercise 9 A tiny pith ball of mass 50 g is suspended by a light thread of negligible mass. The ball is electrically charged and placed in a uniform horizontal electric field. The field is generated by two parallel plates maintained at potentials of -20V and -32V and a separation of 5.0cm. Draw a free body diagram for the ball and calculate the charge q of the ball when it is deflected through an angle of 30°.

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