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Solve the all parts of given problem:

Problem: Three equal positive point charges of magnitude Q = 7.00Î¼ C are located at three corners of a square of edge length d = 11.0 cm. A negative charge -21.00Î¼ C is placed on the fourth corner.

Part A: At the position of the negative charge, what is the magnitude of the electric field due to the three positive charges?

Part B: What is the magnitude of the attractive force on the negative charge?

I just want the right answer for above problem, Thanks!

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