16. 如圖6，一長L的同軸電纜，內徑為a，外徑為b，電流I，則其自感為？
(A)
(B)
(C)
(D)
(E)

17. 如圖7，迴路中電容器C的電壓為V₀，則開始放電後，電容器上的電荷隨時間變化的函數Q(t)為？ (A)CV₀(1-e) (B)CV₀e (C)CV₀(1+e) (D)CV₀ (E)CV₀e

18. 如圖8，一面積a²的正方形線圈以角速度ω旋轉，並施一均勻磁場B̄於其上，則其隨時間變化的感應電動勢ε(t)為？ (A)0 (B)Bωa²t (C)Bωt (D)Bωa²sinωt (E)Bωa²cosωt

19. 經Maxwell修正真空中Ampere定律，統一了電磁，其修正過的定律(A)(B) (C) (D)(E)

20. 一平行板電容器帶電Q及-Q，兩板相距d，兩板間電場數值為E，則其單位面積儲存的電場能為？ (A) (B) (C)(D) (E)ε₀E²

11. Parallel light rays cross interfaces from medium 1 into medium 2 and then into medium 3. What is the correct relation of the index of refraction of these media? (A)  n1 ＞ n2 ＞ n3  (B) n3 ＞ n2 ＞ n1  (C)  n2 ＞ n3 ＞ n1 (D)  n1 ＞ n3 ＞ n2  (E) none of the above

12. A conducting spherical shell of inner radius a = 0.2 m and outer radius b = 0.25 m has a total charge of 5.0 μC on its surface. A point charge of -6.0 μC is placed at the center of the shell. Determine correct item for the electric field E in the regions: (A) a ＜ r , E = 1.0μC/(4πεor2) (B) a ＜ r ＜ b , E = 0 (C) r ＞ b , E = 6.0μC/(4πεor2) C/(4\pi\varepsilon_0 r^2) \)

13. Condition same as above, determine the charge \( q_a \) and \( q_b \) on the inner and outer surface of the conducting spherical shell. (A) qa = -1.0μC  (B)  qb = +6.0μC (C) qa = +6.0μC (D)  qb = -6.0μC

14. Which following statement regarding the electric field or potential is correct? (A) The electric field at a short distance above a single plane, with uniform surface charge density σ, has the magnitude E =σ/ε0, where ε0 is permeability in air. (B) The electric field at any point between two parallel infinite conducting plates, each with uniform surface charge density σ, has the magnitude E =σ2/ε0. (C) The electric field at any point outside two parallel infinite conducting plates, each with uniform surface charge density σ, has the magnitude E = 0. (D) The electric potential at any point between two parallel infinite conducting plates, each with uniform surface charge density σ, has constant value.

16. A loop connected with an AC current, to produce a time varying magnetic field to another loop, called induction loop. The induction loop can be made of plastic or copper. In which of the loops (same area) is the induced voltage greater? (A) the plastic loop (B) the copper loop (C) voltage is same in both case (D) can not be determined

18. The Fermat's principle can be used to derive which of following laws: (A) linear path of light in vacuum (B) law of reflection (C) law of diffraction (D) Snell's law of refraction (E) law of black body radiation

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