Question: A negative charge -0.550C exerts an upward 0.200-N force on an unknown charge 0.300 m directly below it. (a) What is the unknown charge (magnitude

A negative charge -0.550µC exerts an upward 0.200-N force on an unknown charge 0.300 m directly below it.
(a) What is the unknown charge (magnitude and sign)?
(b) What are the magnitude and direction of the force that the unknown charge exerts on the -0.550-µC charge?

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