[领域] (题目相关领域) 电磁学 [来源] (课本习题、考古题、参考书...) Griffiths Problem 6.12(b) [题目] An infinitely long cylinder, of radius R carries a"frozen-in" magnetization parallel to the axis M=ks(方向为延着+z轴) 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 [瓶颈] (写写自己的想法，方便大家为你解答) (a)没什麽太大的问题 但是在写(b)的时候不知道H的方向要如何判断 看了详解 他只写因为对称性所以H为+z方向....然後就写下安培定律了 可是我还是搞不懂+z方向是怎麽看出来的 不知道有没有可以对於(b)来个详细一点的解答呢? 感谢 --

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