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Imagine that two charged objects are the system of interest. When the objects are infinitely far from each other, the electric potential energy of the system is zero. When the objects are close to each other, the electric potential energy is positive. Which of the following statements is(are) incorrect?
a. Both objects are positively chraged.
b. Both objects are negatively charged.
c. One object is negatively charged and the other one is positively charged.

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