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Point charges of 9.00nC are situated at each of three corners of a square whose side...

Point charges of 9.00nC are situated at each of three corners of a square whose side is 0.400m.
A. What is the magnitude of the resultant force on a point charge of -1.50μC if it is placed at the center of the square?
B. What is the direction of the resultant force on a point charge of -1.50μC if it is placed at the center of the square?
C. What is the magnitude of the resultant force on a point charge of -1.50μC if it is placed at the vacant corner of the square?
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