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Formula for Magnetic field at a distance

Discussion in 'General Electronics Discussion' started by Muhammad Umair Khan, Mar 22, 2018.

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  1. Muhammad Umair Khan

    Muhammad Umair Khan

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    Feb 20, 2018
    How can i mathematically calculate (or represent) a magnetic field at any certain distance from a magnet or a solenoid?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Once you are far enough away, the intensity falls with the square of the distance.

    This doesn't work when you're really close.
     
  3. Muhammad Umair Khan

    Muhammad Umair Khan

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    Feb 20, 2018
    What about a distance of 3 to 10 cm??? and how does the relation change with it?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    It depends. If the magnet (or solenoid) is only a couple of mm in size, then yes. If it's a 20cm cube, then no.
     
  5. BobK

    BobK

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    Jan 5, 2010
    Unless you have found a magnetic monopole, it falls off as the cube of the distance (field of a dipole.)

    Near one pole, or near a long straight piece of wire carrying a current, it would be inverse square.

    Bob
     
  6. Muhammad Umair Khan

    Muhammad Umair Khan

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    Feb 20, 2018
    Thanks Bob, but could you put it in a mathematical equation please?
     
  7. BobK

    BobK

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    Jan 5, 2010
    Look up dipole field on google.

    Bob
     
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