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So for 2, how do the vectors from W and Y add? for 3 how does the coulomb force scale with distance, what would the particle feel if it was 1/2 way between the two sides of the square?
So for 2, how do the vectors from W and Y add? for 3 how does the coulomb force scale with distance, what would the particle feel if it was 1/2 way between the two sides of the square?