The figure below shows a point-like charge q = 8.4 μC held at point A, distance a = 83 cm away from the end of a thin insulating rod of length c = 91.5 cm that carries uniform linear charge density λ = 0.378 μC/cm. How much work W needs to be done to move this charge q to point B, also shown in the figure, which is distance b = 3.8 cm away from the end of the rod? : W = J.