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Homework Help: Solenoid Problem

  1. Sep 29, 2006 #1
    (a) How many turns of wire would be on a solenoid carrying a current 4.9 A if the solenoid is 20 cm in diameter, 248 cm long, and the field at the center is 3.3 × 10-3 T?

    The magnetic field of a solenoid is the permeability of free space times the number of turns per unit length times the current.

    Now How do i find the Number of turns per unit length, Is it Length/Diameter * The field of Center? Thanks
    and i know n = N/L so how do i find that
    Last edited: Sep 29, 2006
  2. jcsd
  3. Sep 29, 2006 #2
    Okay so Basically i tried to use N = 2RB/ (uoI) to get the answer but that does not work
  4. Sep 29, 2006 #3

    Chi Meson

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    The diameter of a long solenoid does not matter. The magnetic field (ideally) is B=(uo)nI . Solve for n .
  5. Sep 29, 2006 #4
    thanks alot
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