13. A hollow metal sphere is charged to a potential V. The potential at its center is

(A)V

(B)0

(C)−V

(D)2V

(E)πV

14. A charge Q is located at the center of a cube of edge L, and six other identical charged q are positioned symmetrically around Q as shown in Figure. What's the electric flux through one face of the cube?(A)\( \frac{Q+6|q|}{6\varepsilon_0} \)(B)\( \frac{Q+6|q|}{\varepsilon_0} \)(C)\( \frac{Q-6|q|}{\varepsilon_0} \)(D)\( \frac{Q-6|q|}{4\varepsilon_0} \)(E)\( \frac{Q-6|q|}{6\varepsilon_0} \)

15. Copper contains \( 8.4 \times 10^{28} \) free electrons/m³. A copper wire of cross-section area 1m² carries a current of 1A. The electron drift speed is approximately:(A)1 m/s(B)\( 10^{-4} \) m/s(C)\( 10^{-11} \) m/s(D)\( 10^8 \) m/s(E)\( 10^3 \) m/s

16. Which of the following describes the Faraday's law?(A)\( \oint \vec{B} \cdot d\vec{l} = \mu_0 I \)(B)\( \oint \vec{E} \cdot d\vec{l} = -\frac{\partial \Phi_B}{\partial t} \)(C)\( \oint \vec{E} \cdot d\vec{A} = 0 \)(D)\( \oint \vec{B} \cdot d\vec{A} = 0 \)(E)\( \oint \vec{B} \cdot d\vec{l} = \mu_0\varepsilon_0\frac{d\Phi_E}{dt} \)

17. Rank the electric potentials at points a, b, c, d, and e from highest to lowest, as shown below, noting any cases of equality in the ranking. All the resistors have equal resistance.(A)d ＞ a ＞ b = c ＞ e(B)a ＞ b ＞ d = c ＞ e(C)a ＞ d ＞ b = c = e(D)a ＞ d ＞ b = c ＞ e(E)a ＞ b ＞ d ＞ c ＞ e

18. What's the angular frequency of resonance of a series LC circuit?(A)(B)(C)LC(D)(E)

19. Assume you charge a plastic stick by rubbing it with fur and then hold the stick next to a bar magnet. Do the electric and magnetic fields produced constitute an electromagnetic wave?(A)Yes they do, necessarily.(B)Yes they do because charged particles are moving inside the bar magnet.(C)They can, but only if the electric field of the comb and the magnetic field of the magnet are perpendicular.(D)They can, but only if both the comb and the magnet are moving.(E)They can, if either the comb or the magnet or both are accelerating.

20. A sodium surface is illuminated with light having a wavelength of 300 nm. The work function for sodium metal is 2.46 eV. What's the maximum kinetic energy of the ejected photoelectrons?(A)1.67 eV(B)3.34 eV(C)5.01 eV(D)2.14 eV(E)4.28 eV

1. 電壓1.5V容量1000mAh的充電電池，其儲存能量為多少焦耳？ (A)3600 (B)4800 (C)5400 (D)6400

2. 20和30電阻並聯後，串接於20V的直流電源。若30燒毀斷路後，關於此電路敘述下列何者正確？ (A)流經20 的電流變大 (B)20 消耗功率變小 (C)電源輸出功率變大 (D)電源輸出電流變小

3. 某匝數為N的線圈，通過線性變化且斜率為0.2Wb/sec的磁通量。若線圈的感應電動勢為50V，則N值為何？ (A)10 (B)50 (C)250 (D)500

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