Potential of Point-Charges: A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners. In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.0 × 104 V
B. 1.0 × 105 V
C. 1.0 × 106 V
D. 0 V
E. infinite
Answer: B
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