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Mutual Inductance between Two Solenoids

  1. Nov 3, 2011 #1
    Friends:

    I would like to verify my understanding of mutual induction.

    Coil 1: n1 turns per unit length, radius is r1, has a current I1
    Coil 2: n2 turns per unit length, radius is r2, has a current I2 (in the same direction as I1)

    r1 > r2. Coil 2 is inserted inside Coil 1. What is the mutual inductance (per unit length)?

    I believe it is: M per unit length = μo*n1*n2*pi*(r2)^2

    I think that the mutual inductance is the same for any of the following three scenarios:
    1) Current I1 through Coil 1 only
    2) Current I2 through Coil 2 only
    3) Current I1 through Coil 1 and Current I2 through Coil 2 at the same time.

    Is this true?
     
  2. jcsd
  3. Nov 3, 2011 #2
    Last edited by a moderator: Apr 26, 2017
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