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Reverse >>60271
Since it's a straight wire, the "furce on a line segment is proportional to the vector between the end points AB" which just means the contour integral equals the cross product between the length vector and the magnetic field.
Work is then just the integral of the dot product between the furce vector and the differential length vector (which is a circle if you are rotating it).
>>60272
I probably wouldn't have gone if I could predict the future. The whole point is to escape low-paying jobs, but there's nothing pretty about this economy right now, and I don't know anyone in my life who is genuinely well-off (i.e. without deep debts.