It takes 4.0 ?j of work to move a 20 nc charge from point A to B. It takes -5.0 ?j of work to move the charge from C to B. What is the net work done to move the charge from A to C?
a. 1.0 ?j
b. -1.0 ?j
c. -9.0 ?j
d. 9.0 ?j

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