Potential Energy of Point-Charges: a -3

question 53

Multiple Choice

Potential energy of point-charges: A -3.0-μC point charge and a -9.0-μC point charge are initially extremely far apart. How much work does it take to bring the -3.0-μC charge to x = 3.0 mm, y = 0.00 mm and the -9.0-μC charge to x = -3.0 mm, y = 0.00 mm? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

• A) 40 J
• B) 81 J
• C) 27 J
• D) 6.8 J

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