14. How much energy is stored in the 50-μF capacitor when V_a-V_b = 22 V?
(A) 0.85 mJ,
(B) 0.28 mJ,
(C) 0.70 mJ,
(D) 0.48 mJ,
(E) 0.10 mJ. Il 25gF50

15. In the Drude model of electrical conduction, the current density is directly proportional to (A) the average time interval between successive collisions, (B) the number of charge carriers per unit volume, (C) the square of the electron charge, (D) the electric field present in the wire, (E) the product of all four quantities listed above.

16. The magnitude of the magnetic field at point P, at the center of the semicircle shown below is given by: (A) μ0i/R2, (B) (μ0i/2)R, (C) μ0i/2R, (D) (μ0i/4)R, (E) μ0i/4R.

17. The magnetic flux through a loop perpendicular to a uniform magnetic field will change (A) if the loop is replaced by two loops, each of which has half of the area of the original loop, (B) if the loop moves at constant velocity in a direction parallel to the axis of the loop while remaining in the uniform magnetic field, (C) if the loop moves at constant velocity while remaining perpendicular to and within the unifom magnetic field, (D) if the loop is rotated through 180 degrees about an axis through its center and in the plane of the loop, (E) in none of the above cases.

18. When a switch is closed to complete a DC series RL circuit, (A) the magnetic field outside the wires increases to a maximum value, (B) the electric field in the wires increases to a maximum value, (C) the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed, (D) all of the above are true, (E) only ( A ) and ( C ) above are true.

19. An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of (A) 1.0 m, (B) 2.5 m, (C) 0.10 m, (D) 0.50 m, (E) 3.80 m.

20. A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm. What is the work function (in eV) of the material? (A) 4.5, (B) 3.0, (C) 5.8, (D) 8.0, (E) 1.0.

1.落葉喬木的修剪適期(A)6～8月(B)8～10月(C)1～3月(D)4～6月。

2.可被用來量任何角度值的是(A)丁字尺(B)量角器(C)直尺(D)三角板。

3.建築法規定在一基地上建造駁嵌時必須申辦何種執照？(A)修建執照(B)建造執照(C)增建執照(D) 雜項執照。

4.平戶杜鵑的開花期約在每年的2-3月，請問其花芽分化在何時進行？(A)3-4月(B)7-8月(C)1-2 月(D)11-12月。

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