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Energy of Toroidal Solenoid

  1. Feb 8, 2017 #1
    1. The problem statement, all variables and given/known data

    N=600 (number of loops)
    a1=200mm
    a2=240mm
    h=40mm
    δ=1,5mm or l0
    S0=1,1*S (Cross sectional area)
    B0=1,2T

    I need to find energy of toroid and currect going through it.
    Solution: W=4,08J, I=6,44A
    Capture.PNG
    2. The attempt at a solution

    So far I managed to calculate S and S0:
    S=(a2-a1)*h
    S=0,0016m2
    S0=1,1*S
    S0=0,00176m2


    I tried to find energy using this formula but it's not correct:
    W0=B02*S0*l0/2*μ0
    W0=1,51J

    W=B*H*S*(l-l0)/2 (B and H are from the graph)
    W=4,76J

    Formula for current is I=NH/l but since nothing is correct I didn't bother to try and calculate it.
     
  2. jcsd
  3. Feb 9, 2017 #2

    rude man

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    Homework Helper
    Gold Member

    I see nothing wrong with your formula for W0 and W unless you made an arithmetic error which I suspect you did. For example, I got W = 2.34J.
    Your formula I=NH/l is wrong however so not using it was ironically a good move! :smile:
     
    Last edited: Feb 9, 2017
  4. Feb 9, 2017 #3
    Never mind. I figured it out. Thanks !
     
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