Potential of Point-Charges: Two point charges of +2.00 ?C and +4.00 ?C are at the origin and at the point x = 0.000 m, y = -0.300 m, as shown in the figure. What is the electric potential due to these charges, relative to infinity, at the point P at x = 0.400 m on the x-axis? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 117 kV
B. 15.7 kV
C. 11.7 kV
D. 56.0 kV
E. 36.0 kV
Answer: A
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