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104年 - 104 國立中山大學_碩士班招生考試_電機系(戊組)、電波聯合：電磁學#110200
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題組內容
Problem 3
a.(5%) The dielectric constant for Teflon is 2; it is a low one for a dielectric material. What is the dielectric constant for air?
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沒有 【段考】高二英文 權限，請先開通．
#471711
沒有 【段考】高二英文 權限，請先開通．
#471712
a. (5%) For the inductance, which term drops off at high frequencies? Why?
#471713
b. (5%) The characteristic impedance is defined as, find out the characteristics impedance at high frequencies, and please indicate the unit for it. 新告+
#471714
b.(5%) What is the dielectric constant for a metal, for example, Copper?
#471716
c.(5%) The relative permeability for Steel is 100, and is frequency dependent. What is the relative permeability for Copper?
#471717
a. (5%) Why Curl of Gradient of a potential field is zero, that is, ∇ x ( ∇V) = 0?
#471718
b.(5%) Why Divergence of Curl of a vector field is zero, that is, ∇. ( ∇ X A) =0?
#471719
c.(5%) Refer to the following figure and prove the law of Cosines,
#471720
Problem 5 (20%) A plane wave is normally incident on a dielcctric slab of relative permitivity &, and thickness d. where), and λ0 is the free-space wavelength of the incident wave, as shown in Figure (e). If free-space exists on both sides of the slab, find the reflection cocfficient of the wave reflected from the front of the slab.
#471721
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