A point charge with a charge q1 = 2.50 μC is held stationary at the origin. A second point charge with a charge q2 = -4.90 μC moves from the point (x=0.140m, y=0) to the point (x=0.250m, y=0.250m). What is the work done by the electric field?
a) -3.5 × 10⁻⁴ J
b) -5.2 × 10⁻⁴ J
c) 4.5 × 10⁻⁴ J
d) 6.8 × 10⁻⁴ J