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can you please help me with this question and explain the formulas your using. I've just...

can you please help me with this question and explain the formulas your using. I've just started physics 4b and still getting used to what methods I need to be doing.

thank you!

Three charges, each of magnitude 7 nC, are at separate corners of a square of edge length 7 cm. The two charges at opposite corners are positive, and the other charge is negative. Find the x and y components of the  force exerted by these charges on a fourth charge q = +3 nC at the remaining (upper right) corner. (Assume the +x axis is directed to the right and the +y axis is directed upward.)

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