Intro. Physics!!!

1------- A -10 uC charge is placed 0.20 m away from an unknown charge. The force between the two charges is found to be attractive and has a value of 9.0 N. What is the magnitude and sign of the other charge?

2-------- A -5 uC charge is a distance of 12 cm from a 7 uC charge. What is the magnitude of the force between the two charges? is the force attractive or repulsive?

Thank you!

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