A +30- $\mu \mathrm { C }$ Point Charge Is Initially Extremely Far from a Positive Point

question 105

Multiple Choice

A +3.0- $\mu \mathrm { C }$ point charge is initially extremely far from a positive point charge $Q$ . You find that it takes $41 \mathrm {~J}$ of work to bring the $+ 3.0 - \mu \mathrm { C }$ charge to the point $x = 3.0 \mathrm {~mm} , y = 0.0 \mathrm {~mm}$ and the point charge $Q$ to the point $x = - 3.0 \mathrm {~mm} , y = 0.00 \mathrm {~mm}$ . What is $Q$ ? $( k = \ldots )$

• A) \(4.6 \mu \mathrm { C }\)
• B) \(55 \mathrm { nC }\)
• C) \(27 \mathrm { pC }\)
• D) \(9.1 \mu \mathrm { C }\)

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