A +30-µC Point Charge Is Initially Extremely Far from a Positive

question 20

Multiple Choice

A +3.0-µC point charge is initially extremely far from a positive point charge Q.You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm,y = 0.0 mm and the point charge Q to the point x = -3.0 mm,y = 0.00 mm.What is Q? (k = …)

• A)55 nC
• B)9.1 µC
• C)4.6 µC
• D)27 pC

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