Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart
What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -36 mJ
B) +18 mJ
C) 0 mJ
D) +36 mJ
E) -18 mJ
B
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