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3) A very small ball of mass 0.60 g has a charge of 8.0 uC. The ball is suspended from a vertical string in an electric field of 300 N/C in a downward direction. What is the tension in the string if the charge on the ball is (a) positive (b) negative

Answer key (a) 8.3 mN; (b) 3.5 mN

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