Identical point charges Q are placed at each of the four corners of a 3.0-m × 4.0-m rectangle. If Q = 40 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 3.0 N
B. 2.4 N
C. 1.8 N
D. 3.7 N
E. 2.0 N
Answer: B
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