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Derivation Problem (Magnetic Field)

  1. Nov 26, 2014 #1
    1. The problem statement, all variables and given/known data
    Hi, I'm having trouble solving this problem: hY8ScX3.png
    I can't seem to get to the right derived formula. The one selected is wrong. I'm still attempting to solve this.

    2. Relevant equations
    B= 8 M0 N (I - I0)
    1251/2 a

    e = 2V
    m B2 R2

    3. The attempt at a solution
    E1k2TCT.jpg

    Here's my attempt at it.
     
  2. jcsd
  3. Nov 27, 2014 #2

    andrevdh

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    Homework Helper

    Seems to me that it is the 6th answer from the top since
    Bf = 2Bj where Bj = φ(Ij - Io)
     
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