A system of charges are shown in the figure. What is the electric potential energy of the following system of charges?
1. U = kQ2 / ℓ
2. U = 0
3. U = kQ2 / 3ℓ
4. U = kQ2 / ℓ2
5. U = - kQ2 / 2ℓ
6. U = - kQ2 / ℓ
7. U = - kQ2 / 3ℓ
8. U = kQ2
9. None of these.
10. U = kQ2 / 2ℓ
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