Potential of Point-Charges: Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.3 MV
B. 2.9 MV
C. 3.5 MV
D. 7.8 MV
Answer: B
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