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Homework Help: Magnetic Flux and Peak Emf

  1. Dec 10, 2008 #1
    A coil is located at the center of a long solenoid of radius R = 15cm which has 5x10^7 turns per meter and carries a current I = 16A. The coil is coaxial with the solenoid and consists of 5 turns of wire each in the shape of a square of length a = 5cm on each side.What is the magnetic flux passing through each loop of the coil? If the current in the solenoid is not constan but varies as I=Im cos wt, where Im = 16A and w = 10rad/sec, find the peak emf induced in the coil.

    I would like to offer relevant equations but I don't think I have any. I have tried the equations I thought were relevant without coming up with the correct equation

    flux = NiA -> 16*.05*5=4 but the correct answer is 2.5. I haven't even got a clue about peak emf...
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Dec 10, 2008 #2


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    Magnetic field B at the center of a long solenoid is mu_0*n*I, where mu_0 = 4*pi*10^-7. And flux = B*A
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