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## Homework Statement

I need to analyze these pictures for my homework and find out the curl of the vector field at the point (red) on the picture.

## Homework Equations

http://i1242.photobucket.com/albums/gg525/sjrrkb/ScreenShot2012-11-26at61615PM.png

## The Attempt at a Solution

basically I can calculate curl and divergence and evaluate them mathematically...but when it comes to analyzing a picture and determining the curl at a given point on a vector field I am totally lost. Any assistance....in the form of answers, places I can go to get help, or just suggestions would be appreciated.