Potential of Point-Charges: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point A, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 0.899 kV
B. 8.99 kV
C. 89.9 kV
D. 899 kV
E. 8990 kV
Answer: C
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?
?
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