Four point charges have the same magnitude of 3.5 × 10-12 C and are fixed to the corners of a square that is 8.7 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.
Find the field due to each of the four charges and add them to find the net field at the center of the square as shown below. Field due to 2 diagonally opposite positive charge will be zero at the center of the square because they have equal and opposite field at the center.
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