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What's the difference

  1. Aug 13, 2007 #1
    what' the differnece between a circular coil of wire of many turns and a solenoid.
  2. jcsd
  3. Aug 14, 2007 #2


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    Staff Emeritus
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    Isn't that exactly what a solenoid is: a circular coil of wire with lots of turns in it?
  4. Aug 14, 2007 #3


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    Correct. But by 'popular' terminology, most people think of a solenoid as being a mechanical device consisting of a moveable core within the solenoid coil, as in an automotive starter or a model train track switch.
  5. Aug 14, 2007 #4


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    Staff: Mentor

    To me, a solenoid is a "stretched out" coil, that is, its geometry is a cylinder, and the length is significant.

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  6. Aug 14, 2007 #5
    thanks that seems logical now...becaus ei was working out through the formulaes for the magnetic field due to each....

    so circular coil is a coil of negligible length and same radius
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