physics

A negative charge of -0.550 uC 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 uC charge?

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  1. A charge of -0.600 exerts an upward 0.150- force on an unknown charge 0.260 directly below it.

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  2. please can anybody help me with this problem..i am so confused

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