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

複選題1. A static charge distribution produces a radial electrical fieldwhere A and b are constants. Which are possible total charges Q?(A) 4TE0A(B) 2TE0A(C) 0(D) -2TE0A(E) -4TTE0A

2. If Pis the polarization vector and E is the electric field, then in the equation = , a in general are (A) Scalar (B) Vector (C) Tensor (D) Number (E) Matrix

3. Given that ▽ㆍF = D and ▽x F = C, which are true? (A) ▽.C=0 (B)▽.D=0 (C) ▽C=0 (D) ▽D =0 (E) F =▽U+▽XW 

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.

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.

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

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

40. A 50-Ω transmission line is connected to a load of impedance ZL = 35 + j80Ω. Design a double-stub matching circuit shown in the Fig. 6. Short-circuited stubs are used and the position of the second stub is d =λ/8. (A) (B)(C)(D)(E) It is impossible to match the load using the double-stub matching circuit.

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