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Homework Statement
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 sphereQuestion:
How much work would the field do if a proton were moved from infinity to 0.16m? comment on the meaning of the sign.
Homework Equations
W = -ΔU = -q * ΔV
1 e = 1.60 x 10 ^-19 C
1 proton = +1e
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?