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Four point charges have the same magnitude of 3.5 × 10-12 C and are fixed to...

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.

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Answer #1

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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