How Much Work Must We Do on an Electron to Move

Multiple Choice

How much work must we do on an electron to move it from point A, which is at a potential of +50V, to point B, which is at a potential of -50 V, along the semicircular path shown in the figure? Assume the system is isolated from outside forces. (e = 1.60 × 10^-19C)

A) 1.6 J
B) 1.60 × 10^-17 J
C) -1.60 × 10^-17 J
D) -1.6 J
E) This cannot be determined because we do not know the distance traveled.