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Thread: Why a magnetic flux in closed surface area is always 0?

  1. #1 Why a magnetic flux in closed surface area is always 0? 
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    Why a magnetic flux in closed surface area is always 0?


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  3. #2  
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    Magnetic lines of flux that pass through the closed area must always return. In one direction they are + and the other direction they are - so the result must always be zero.


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  4. #3  
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    Because you can isolate a single magnetic pole and thus the closed surface will always enclose two unlike poles.
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  5. #4  
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    my physics prof likes to do the water analogy. suppose you have a river and you dam it. No matter what kind of shape your dam is, the same amount of water flows through it. So no matter what shape your surface is, same amount of flux go through it (Gauss's Law gives it as a closed surface integral with dot product between field and area, which works because then the cos theta part would eliminate the component of the field that's parallel to the surface, which doens't contribute as flux.) And assuming naturally there is no source of field in the surface or it can somehow retain fields, the same amount of flux would go out, and then you'd have zero net flux.
    What Imagination seizes as Beauty must be Truth ----John Keats
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