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希望星期日前得到答案

Jan 10th 2014, 19:14

1.電流I在一無窮長、具圓形橫截面、半徑為a的導體流動，是由安培定律證明
(a) 0≤r≤a時，磁通密度B正比於r
(b) a≤r時，磁通密度B正比於1/r

2.下列平面波為哪一種極化波?
(線性極化波、左旋圓形極化波、右旋圓形極化波、橢圓極化波)
(a)E=(AxA+AyB)e^(-jkz)
(b)E=(AxA+jAyA)e^(-jkz)
(c)E=(AxA+jAyB)e^(-jkz)
(d)E=(AxA-jAyA)e^(-jkz)
其中A、B為任意正實數

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