[PLAIN]http://img232.imageshack.us/img232/7172/60746674.png [Broken] 1. The problem statement, all variables and given/known data The picture attached to this question shows a magnetic slab with μr = 50. A thin conducting film (with μr = 1) lies on top of the slab and carries a surface current of 1.0[A/mm] directed out of the page. If magnitude of B1 = 0.01 [T] and θ1 = 10o, find magnitude of B2 and θ2. I apologize in advance for my bad recreation of the image in the text! 2. Relevant equations 1.) B1n = B2n 2.) (1/μ1)B1t - (1/μ2)B2t = Js 3. The attempt at a solution So, for starters, I am assuming μ1 = μo = (4*pi)e-7. Please let me know if I cannot make this assumption, but I believe I can. Because angles are involved that are not perfectly 90o, I have to include sines and cosines in the equations above. Using formula #1 --> (0.01)*cos(10o) = B2cos(θ2) = 0.009848. Using formula #2 to find θ2, I can plug in values to have: (1/μo)0.01*sin(10o) - (795774.72)B2sin(θ2) = 1000[A/m] Solving for θ2, I find that the angle is 90o. However, this is not the answer in the back of the book. The answer for θ2 in the back of the text is 86.2o and a magnitude of B2 to be 0.15[T]. I was also not receiving this value for B2. I have a feeling that my problem is that I cannot assume that μ1 = μo. Please help me! Thanks for all help in advance!