1. The problem statement, all variables and given/known data A +35[tex]\mu[/tex]C charge is placed 32 cm from an identicle +35[tex]\mu[/tex]C charge. How much work would be required to move a +.5[tex]\mu[/tex]C test charge midway between them to a point 12cm closer to either of the charges? 2. Relevant equations Wext = -qV V = kQ/r 3. The attempt at a solution Q= +35[tex]\mu[/tex]C, q = +.5[tex]\mu[/tex]C I found the initial V, Vi = 2KQ/.16 and then the final V, Vf = KQ[1/.28 +1/.04] Then I did W = -q(Vf-Vi) and got -2.5J However, the answer is +2.5 J. This makes sense that the answer is positive- you're moving a + charge from an area of lower to higher potential. Why doesn't this agree with my formula though?