Four point charges in air are placed at the four corners of a square that is 30
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Four point charges in air are placed at the four corners of a square that is 30 cm on each side. Find the potential at the center of the square if
(a) The four charges are each +2.0 μC and
(b) Two of the four charges are +2.0 μC and two are −2.0 μC.
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