複選題

8. Assume the wave guide is a perfect conductor, so that the boundary conditions
ㆍ Given the general form
determine which expressions are true?
(A)
(B)
(C)
(D)

(E)

複選題4. Suppose a point charge q is held a distance d above an infinite grounded conducting plane. Given that the conducting plane is the x-y plane and the point charge q is at (0, 0, d). (A) The potential on the conducting plane is constant. (B) The potential far away from the charge is 0. (C) An image charge q can be set at (0, 0, -d) to remove the conducting plane while still satisfying the same boundary conditions. (D) The induced charge on the conducting plane is O (E) The induced charge on the conducting plane is

複選題5. An uncharged metal sphere of radius R is placed in an otherwise uniform electric filed . The field will push positive charge to the northern (i.e., z＞ 0) surface of the sphere, leaving a negative charge on the southern surface. (A) The potential at r→∞ is 0. (B) The potential when r ＞＞ R (the radius of the sphere) is -E0rcosθ. (C) The potential inside the sphere is E0rcosθ. (D) The potential on the surface of the sphere is E0Rcosθ. (E) The induced charge density is -3E0E0cosθ.

6. Given that dipole moment and polarization . (A) (B)(C) (D) (E)

複選題7. Which are correct with the Poynting vector ? (A) is the energy per unit area and per unit time, transported by the electromagnetic fields. (B) is the electromagnetic force per unit area acting on a surface. (C) /c2 is the momentum current density transported by the fields. (D) /c2 is the momentum per unit volume stored in the electromagnetic fields. (E) /c2 is the work done on the charges by the electromagnetic force.

9. A spherical shell of radius R, carrying a uniform surface charge o, is set spinningat angular velocity .(A) The vector potential for r≤R(B) The vector potential for r≤R(C) The vector potential for r≤R(D) The magnetic field for r≤R(E) The magnetic field for r≤R

10. Suppose a normal incidence occurred between tow linear media (n1 →＞ n2)(A) The reflection coefficient (B) The reflection coefficient (C) The reflection coefficient (D) The transmission coefficient (E) The transmission coefficient

1. 簽發票據清償對供應商之欠款會導致資產減少、權益減少。(A)O(B)X

2. 一筆調整分錄一定會同時影響資產負債表項目及綜合損益表項目。(A)O(B)X

3. 在物價上漲時，期末存貨採用先進先出法評價是最能接近目前的市價。(A)O(B)X

4. 應收帳款之呆帳採用備抵法處理時，沖銷呆帳會造成應收帳款淨變現價值 減少。(A)O(B)X