Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
A. 22 J
B. 16 J
C. 13 J
D. 19 J
E. 8.0 J
Answer: B
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