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Homework Help: Self Inductance of a Solenoid Problem

  1. Apr 8, 2014 #1
    1. The problem statement, all variables and given/known data
    Hi again guys, been stuck on this problem for a while now, thought it would be a simple bumping in some values in a given equation question but I can't get the correct answer :confused: Heres the problem:

    What is the inductance of a 600 turn coil wound on a core of cross sectional area 450mm2 , length of 500mm and a relative permeability of 25?

    2. Relevant equations
    I assumed the equation I would use would be L=μ0μrn2Al
    Where n = number of turns
    A = cross sectional area
    l = length
    μ0 I took as 12.6x10^-7
    and μr = 25

    3. The attempt at a solution
    When I put all these values into the equation I get 2.55, where as the given answer is 10mH. I'm stumped :confused:
  2. jcsd
  3. Apr 8, 2014 #2
    The correct equation is: [tex] L=\frac{\mu_0 \mu_r n^2 A}{l} [/tex]
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