Potential Energy of Point-Charges: a Tiny Object Carrying a Charge

Multiple Choice

Potential energy of point-charges: A tiny object carrying a charge of + 3.00 μC and a second tiny charged object are initially very far apart. If it takes of work to bring them to a final configuration in which the object i is at x = 1.00 mm, y = 1.00 mm, and the other charged object is at x = 1.00 mm, y = 3.00 mm, find the magnitude of the charge on the second object. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

A) 2.15 μC
B) 4.30 μC
C) 10.74 μC
D) 4.30 nC