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Homework Help: Mutual Inductance in a solenoid

  1. Mar 9, 2010 #1
    1. The problem statement, all variables and given/known data
    A long solenoid (black coil) with cross-sectional area A cm^2 and length L is wound with n1 turns of wire. A time-varying current i1 flows through this wire. A shorter coil (blue coil) with n2 turns of wire surrounds it. Use (uo)(m*kg/s^2*A^2)
    1) Find the value M of the mutual inductance.

    Note: The current in coil 1 is constantly changing. However, when using the hints it may help you to consider the instant at which the current in coil 1 is A.

    I dont exactly know how to post the image

    2. Relevant equations

    I used the above equation

    3. The attempt at a solution
    I got M = P*n1*n2*A/L but it was wrong. Not sure where I went wrong. Any help would be appreciated
  2. jcsd
  3. Mar 9, 2010 #2
    if a pic is necessary, i can probably describe it
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