00:01
Okay, for this part, the n vector for the unit circle on the xy plane will be 0, 0, and 1.
00:08
K is the only one.
00:10
So then we're going to use stokes ' theorem.
00:13
When stokes ' theorem is f dot dr is equal to curl of f dot n, da, and this is the r region.
00:27
So for this one, for the first part, theta is going to be 0 to 2 pi, r is going to go 0 to 1, and then the only term is, oh i don't know why i wrote k there, it's just 2, because that's the only one that survives, so that means 2.
00:54
We switch to polar coordinates, believe it or not.
00:57
Yeah, so this one is r squared over 2 cancels out, r squared 0 to 1.
01:06
So that's 1, d theta, and that's 0 to 2 pi...