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A student is performing an experiment with two identical small metal balls, A and B.Initially, ball A contains 6.0-?C net charge with unknown sign and ball B is neutral. The student brings them in contact and then separated them by 20 cm. Both of the balls are remain isolated. (a) Is the electric force between A and B attractive, repulsive or zero? (b) What is the magnitude of the electric force between the balls?

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