Question

Two charges of +3 μC and –3 μC are placed 2 cm apart in air. What is the electric potential energy of the system? (Take \( k = 9 \times 10^9 \) Nm\(^2\)/C\(^2\))

• A. \( -0.05 \, \text{J} \)
• B. \( -4.05 \, \text{J} \)
• C. \( +0.405 \, \text{J} \)
• D. \( -40.5 \, \text{J} \)

Hint:

Tip: Remember that potential energy between opposite charges is negative, indicating attraction.