A user writes:
Four particles with charges +5.00 micro Couloumbs, +3.00 micro Couloumbs, 3.00 micro Couloumbs and -5.00 micro Couloumbs are placed at corners of a 2.00m X 2.00m square. (a) Determine the electric potential at the center of the square, assuming zero potential at infinity. (b) If one of the +3.00 micro Couloumb charges is replaced by a +4.00 micro Couloumb charge, what is the electric potential at the squares center?

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