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Thread: why the magnetic field of the electrons is circular instead

  1. #1 why the magnetic field of the electrons is circular instead 
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    why the magnetic field of the electrons is circular instead of triangular? (in conductor with current)


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  3. #2  
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    What makes you think it should be triangular?


    Sometimes you eat the bahr, and, well, sometimes he eats you. ---Anon
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  4. #3  
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    Quote Originally Posted by BenTheMan
    What makes you think it should be triangular?
    My question is why it is not in other shape?
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  5. #4  
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    It is symmetrical in all directions in its plane. Only a circular field has that property.
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  6. #5  
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    Electrons have magnetic fields? That's news.
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  7. #6  
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    Well, move a compass around a wire conducting current and see what happens. It looks like magnetism to me.

    Yes, we both know it is the current that generates the magnetic field, not the electrons themselves. But we can deduce what the OP was asking, even if there may be a small language ambiguity.
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  8. #7  
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    Well my view on these things is that it's best to be absolutely clear, otherwise people carry their misconceptions and others reading this post will see no reason to challenge them and... well, it's just better in the long run to be picky, for clarity you understand.

    As for the 'magnetic field' being circular, I'm not too "up" on my electromagnetism but I gather that would be that the surface of equipotential (so that the magnetic force lines are everywhere normal to this surface) is circular. This is only the case for a monopole, and isolated monopoles have not yet been found in nature or even in the lab. Conceptually, the surface is circular (or perhaps spherical would be a better term) because the magnetic potential is inversely proportional to the distance squared. Which basically means that at a fixed distance, the potential is also fixed, and because the sphere has its surface everywhere at a fixed distance from its centre, geometrically the surface of equipotential around a monopole is spherical.
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  9. #8  
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    And is it acting like dipole "magnet"?
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