Skip to main content

Section 4.4 Example using Green's Theorem

Let's actually compute this out. We'll verify both parts of Green's Theorem by computing both sides of the equation for each part.
Learning Objectives:
  1. Compute Circulation and Flux via Green's Theorem
TYPO:Circulation density is \(\frac{\partial N}{\partial x}-\frac{\partial M}{\partial y}\text{.}\) At 2:30 I compute partial of M w.r.t x instead. So the integrand for the double integral should ONLY be y.

Post-Video Activities Post-Video Activities

Consider the triangular curve going counterclockwise from (0,0) to (1,0) to (0,1) and back to (0,0). Let \(\vec{F}=2y\hat{i}+x\hat{j}\text{.}\) Use Green's Theorem to compute the counterclockwise circulation two ways:

1.

As the circulation density is a constant, you can use the fact that you already know the area of this triangular region to compute the double integral quickly !

2.

To verify, you can use our multivariable calculus methods for double integrals to compute it out
Answer.
-1/2