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#1
Feb 22 2017 05:30pm
So I am looking at an equation.. it is simplified as follows:

integral (q/r^2 * r-hat * r-hat * dr) ---------> integral (q/r^2 * dr)

essentially cancelling out the r-hats. I am wondering why this happens.
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#2
Feb 22 2017 05:51pm
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#3
Feb 22 2017 09:04pm
r-hat is a unit vector. A unit vector multiplied by itself is equal to one. This is why they "cancel" out.
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