Chapter 30209P30.69There is no contribution from the straight portion of thewire since dsr×=±0. For the field of the spiral,dIdrBIdrIdrrBIrdrIrB=×==FHGIKJLNMOQP−−=−=zzzµπθ0202020202020201024442341afbgej±sin±sinFIG. P30.69Substitute re=:BIeIeeIe=−−=−−−−ππ0020200241out of the page.P30.70(a)BBM=+00M=−00and M=−00Assuming that Band B0are parallel, thisbecomes M=−00.The magnetization curve gives a plot of Mversus B0.(b)The second graph is a plot of the relative
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