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A point charge Q = +4.0 μC is placed in a vacuum. The electric potential V at a distance of r = 0.5 m from the charge is:

a. 2.88 × 10⁴ V
b. 9.0 × 10⁴ V
c. 8.99 × 10³ V
d. 7.2 × 10⁴ V