A point charge of 300 C and a second charge Q are initially

A point charge of +3.00 C and a second charge Q are initially very far apart. If it takes of work to bring them to a final configuration in which the charge is at the point x = 1.00 mm, y = 1.00 mm, and the second charge Q is at the point x = 1.00 mm, y = 3.00 mm, find the magnitude of the charge Q. (k = 1/40 = 8.99 × 109 N • m2/C2)

work = Kq1Q2/r = 8.99 *10^9 * 3*10^-6 *Q / 2 *10^-3 =29

so Q= 29*2/(8.99*3) * 10^-6 = 2.15 * 10^-6 C