Two objects with charges +q and -2q are separated by a distance r. You slowly move one of the objects closer to the other so that the distance between them decreases by half. Considering the two objects as the system, which statements are incorrect?
(a) The electric potential energy of the system doubles.
(b) The electric potential energy of the system decreases by half.
(c) The magnitude of the electric potential energy doubles.
(d) The magnitude of the electric potential energy decreases by half.
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