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Thread: magnetic field gradient

  1. #1 magnetic field gradient 
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    I need to design a coil that generates a magnetic field in just one direction and with a gradient in the same direction but not in the others. ie., dBx/x=0, dBy/y=0 and dBz/z = K. Does anyone know if this is possible?. I appreciated if someone can answer this question...... Thank You...


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  3. #2  
    Forum Professor leohopkins's Avatar
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    To generate a magnetic field in just one direction ?

    Sorry, but its impossible.

    May I ask, what is this for ?


    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  4. #3  
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    Quote Originally Posted by leohopkins
    To generate a magnetic field in just one direction ?

    Sorry, but its impossible.

    May I ask, what is this for ?
    Why? All magnetic fields have a direction, and permanent magnets have fixed fields.

    The original poster needs to clarify their question, do you men going out of one pole in a straight line and on forever? if so this is certainly theoretically possible....

    Maybe leo can tell us how...
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  5. #4  
    Forum Professor leohopkins's Avatar
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    Certainly it has been proposed that "monopoles" existed at one time, although creating them is very difficult and also very dangerous.
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  6. #5  
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    Nope, wrong answer!

    The correct answer is that if a magnet were sufficiently strong and had diametrically opposed poles extending to 'infinity' the curvature of our universe could re-unite the poles in a straight line, but, the continued expansion of the universe together with the magnetic field travelling at light speed would mean they could continue in a straight line indefinitely.

    This could not happen however as the motion of the earth through the heavens would cause the lines to assume a complex set of linked corkscrews.
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  7. #6  
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    Quote Originally Posted by Megabrain
    Nope, wrong answer!

    The correct answer is that if a magnet were sufficiently strong and had diametrically opposed poles extending to 'infinity' the curvature of our universe could re-unite the poles in a straight line, but, the continued expansion of the universe together with the magnetic field travelling at light speed would mean they could continue in a straight line indefinitely.

    This could not happen however as the motion of the earth through the heavens would cause the lines to assume a complex set of linked corkscrews.
    So, the answer is "no" isnt it ?
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  8. #7  
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    Impractical yes, impossible no.
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