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True or false: Stokes's theorem requires the surface of integration to be flat.

  • A.True, a curved surface having no unique normal direction at each point
  • B.True, unless the curl of the field vanishes over part of the surface
  • C.False, but the surface must be closed rather than open
  • D.False, any open surface spanning the closed path serving equally well

Answer: D

Any surface spanning the closed curve will do, flat or not, since the line integral round the boundary is the same for all of them. A closed surface, on the other hand, has no bounding curve at all, so the theorem then gives zero.

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