Help with Coulomb's law problem

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Homework Statement


The correct answer is 20.3 kg, but I got 23.4 kg. What did I do wrong here? Please refer to part 3 for the problem question.

Homework Equations


Refer to part 3.

The Attempt at a Solution


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It's the vertical component of the net electrical force that must balance the weight, not the sum of the magnitudes. Force is vector.
 

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