alleryStart learning →Two charges 5 nC and -2 nC are 18 cm apart. What is their electrostatic potential energy?
A+0.5 microjoule
B-0.05 microjoule
C-5 microjoule
D-0.5 microjoule
Answer & Solution
Correct answer: D. -0.5 microjoule
U = 9e9 x 5e-9 x (-2e-9)/0.18 = -5e-7 J, negative because the charges attract.
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