The electric potential at the origin of an xy-coordinate system is 40 V. A -8.0-μC charge is brought from x = +∞ to that point. What is the electric potential energy of this charge at the origin?
Answer

A) 8.0 μJ

B) 40 μJ

C) -3.2 × 10-4 J

D) -40 μJ

E) 3.2 × 10-4 J