Question

If ∫ o f .dr = 0 - over a closed curve, then

Answer 1

Answer:

zero

Explanation:

When you do close surface integration of force over a path, then it accounts for the potential energy. But, if you wanna talk about integrating over a closed surface, then you will be back at the point you started from. The potential energy at the same point will be zero. U(2)-U(1)=U-U=0