(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

This is not a HW prob. Just a question.

When doing surface integrals, why should the area element dsbe dotted with the normal. I don't get it .

[tex]\oint[/tex]A.n ds

2. Relevant equations

3. The attempt at a solution

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# Surface integral

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