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Statement of a problem № 2822

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Four point charges 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 nC and (b) two of the four charges are +2.0 nC and two are —2.0 nC.

Solution:
Four point charges are placed at the four corners of a square that is 30 cm on e

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