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Self inductance of a solenoid

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    demostrate that the self inductance of a selonoid (L) that have: length = "l"; radius= "a" ; number of turns per unit of length= "m" , is:

    2. Relevant equations
    L = pi*(m2)*(a2)*Uo*[ ( (l2)+(a2) )1/2) - a ]

    3. The attempt at a solution
    It is suposse that the selfinductance is just
    L= pi*(m2)*(a2)*Uo * l

    but i dont understand how they get the expression [ ( (l2)+(a2) )1/2) - a ]

    please help!
    Last edited: Nov 3, 2009
  2. jcsd
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