1. The problem statement, all variables and given/known data The force exerted by an electric charge at the origin on a charged particle at point (x,y,z) with position vector r = <x,y,z> is F(r) = Kr / |r|^3 where K is a constant. Find the work done as the particle moves along a straight line from (2,0,0) to (2,1,5). 2. Relevant equations 3. The attempt at a solution So if it moves from (2,0,0) to (2,1,5) I can parametrize: x = 2 Y = T Z = 5T for 0<t<1 so r(t) = (2, T, 5T) r'(t) = (0, 1, 5) But how do I put the force function F(r) = Kr / |r|^3 in terms of these parameters so I can do the integral?