[題目] 有關電磁學
[領域] (題目相關領域)
電磁學
[來源] (課本習題、考古題、參考書...)
Griffiths Problem 6.12(b)
[題目]
An infinitely long cylinder, of radius R carries a"frozen-in" magnetization
parallel to the axis M=ks(方向為延著+z軸)
where k is a constant and s is the distance from the axis;there is no free
current anywhere.
Find the magnetic field inside and outside the cylinder by two different
methods:
(a)As in Sect. 6.2, locate all the bound currents, and calculate the
field they produce.
(b)Use Amperes law to find H, and then get B from H=B/u0 - M
[瓶頸] (寫寫自己的想法，方便大家為你解答)
(a)沒什麼太大的問題 但是在寫(b)的時候不知道H的方向要如何判斷
看了詳解 他只寫因為對稱性所以H為+z方向....然後就寫下安培定律了
可是我還是搞不懂+z方向是怎麼看出來的
不知道有沒有可以對於(b)來個詳細一點的解答呢? 感謝
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