Four point charges are on the rim of a circle of radius 10 cm. The charges are (in ?C) +0.50, +1.5, ?1.0, ?0.50 . If the electrical potential at the circle's center due to the +0.5 charge alone is 4.5 × 10^4 V, what is the total potential at the center due to the four charges combined?
a. 18 × 10^4 V
b. 4.5 × 10^4 V
c. zero
d. ?4.5 × 10^4 V
b
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