所屬科目：中山◆電機◆電磁學
(4%)(b)0=之小路徑。( )裏應填什麼?
(4%)(c)利用Divergence theorem for∇.E寫下E和(真空中有一chargeQ)的關係,and
(4%)(d)利用 Stokes'theorem for∇xB寫下B和I真空中有一currentl的關係。
(4%)(e)在運算 Divergence ∇•A或Cur∇✖A時(A為一向量場),我们選的體積或面積在大 少和形狀各有何限制?
2.(5%) Using the Method of Image, write down the potential distribution, V(r, y, z), for a point P(x, y, z) in the space, Fig. 1, the dielectric constant of the space is ε0. Q is a positive point charge of Q 庫命 Coul.
(a)請問Polarization vectorP 為何?在 relative permeability 為μr(=1+Xm)的一ferromagnetic material外面線圈通電流,在其內部產生磁場為H(A/m),
(3%)(c)銅的導電性很好,它的 permittivityε和permeabilityμ各為何?請簡單提供你的理由。
(4%)(b)請問在地(Ground,即半徑b粗體部分)外的 magnetic flux density B值為何? The capacitance of a line charge of radius a over a ground O, as shown in Left of Fig. 3 C =.
(4%) (c) Find the external inductance L for such a transmission system in air using a quasi-TEM property
(4%) (d) Using the result from a), along with the per unit length external inductance found in c), write down the internal & external inductance for the conductor system shown in the Right of Fig. 3.Fig. 3. A single conductor above a Ground (Left); A two-conductor system with currents flow in opposite direction (Right); the two conductors both with radius a and d distance apart.
5.(10%) A right-hand circularly polarized wave represented by the phasor is incident normally from air onto a perfect conductor at z = 0. Find the induced current on the conducting wall.
(a) Determine Z0, a, and β of the line.
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, the dot product of at and an?
之小路徑。( )裏應填什麼?
at high frquencies請務必將 internal inductance拿掉,並寫Zc之單位(即簡化
)。
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is incident normally from air onto a perfect conductor at z = 0. Find the induced current on the conducting wall.