1. The problem statement, all variables and given/known data Known: Potential Difference of range 0.16 m < r < infinity is -562 kilovolts At r = 0.16 there is a -10 μC charge on a conducting sphere Question: How much work would the field do if a proton were moved from infinity to 0.16m? comment on the meaning of the sign. 2. Relevant equations W = -ΔU = -q * ΔV 1 e = 1.60 x 10 ^-19 C 1 proton = +1e 3. The attempt at a solution q = 1.60 x 10 ^-19 C ΔV = -562 kV W = -q * ΔV ... = -1.60 x 10 ^-19 C * -562 kV ... = 89.9 x 10 ^-15 J However, shouldn't a proton wan't to approach a negative charge and thus the work should be negative?