Can Gauss's law apply to both volume and area?

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FS98
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I believe the electric flux within a closed space can be found with the equation phi = Q/ε0. Can this be used for volume and area, or just volume?

Also what good does this do. Why would I want to know the electric flux of something?
 
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FS98 said:
Why would I want to know the electric flux
e.g. If you wanted to know how an electron beam will behave, it is important to know the Electric (and Magnetic) Fields along its path.
 

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