A 0.200-g ball in air hangs from a thread in a uniform vertical electric field of 3.00

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A 0.200-g ball in air hangs from a thread in a uniform vertical electric field of 3.00 kN/C directed upward. What is the charge on the ball if the tension in the thread is 

(a) Zero and 

(b) 4.00 mN?

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