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Homework Help: Solenoid Magnetic Field Help

  1. Aug 7, 2010 #1
    1. The problem statement, all variables and given/known data
    You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire.
    a)What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible?
    b)What magnetic field strength would you obtain at the center of a single circular loop made from the wire?

    2. Relevant equations
    B=u0nI
    B=u0I/2r

    3. The attempt at a solution
    a) n=pi*0.002=0.00628 or n=12/.00628=1909.86 not sure on this
    B=4pi*E-7nI B=1.34*1076T or B=4.08*10-2
    b) B=4piE-7=17/(2*.001)=1.1-3T


    b is definitely wrong but I dont know why and I am completely unsure on a.
    all help appreciated.
     
  2. jcsd
  3. Aug 7, 2010 #2

    rl.bhat

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    Homework Helper

    n = 12/π*0.0205

    Radius of the single loop = R = 12/2π
     
  4. Aug 7, 2010 #3
    thanks for that, do you know whats wrong with a???
     
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