15. An LC circuit, as shown in the diagram, reaches a certain state a moment after being energized. The circuit bas an inductance value of L = 4 Wb/A and a capacitance value of C= 4 A . s/V, with the assumption that the circuit's resistance can be ignored. Under these conditions, the circuit will ultimately exhibit:

(A) no current flow.
(B) oscillating current with a period of 16 seconds.
(C) oscillating current with a period of 3.14 seconds.
(D) oscillating current with a period of 12.56 seconds.
(E) oscillating current with a period of 25.12 seconds.

11. In a binary star system, Star A, which has triple the mass of Star B, orbits their common center of mass in circular patbs. Without external forces, what is the relationship between their orbital periods according to Newton's law of universal gravitation? (A) Star A's period is 1/ of Star B's. (B) Star A's period is the same as Star B's. (C) Star A's period is times Star B's. (D) Star A's period is twice Star B's. (E) Star A's period is half of Star B's.

12. What is the restoring constant (torsional constant) for a disk of mass 3.0 kg and radius 0.20 m oscillating with a period of 2.0 s? (A) 7.87 Nㆍm, (B) 0.24 Nㆍm, (C) 0.59 Nㆍm, (D) 1.12 Nㆍm, (E) 3.56 N ㆍm.

13. A 1.2 kg croquet ball moving at t2.0 m/s is struck from bebind by the impulse force shown in Figure 7. What is the final velocity of the croquet ball? (A) 0.3 m s-1, (B) 10.3 m s-1, (C) 20.3 m s-1, (D) 30.3 m s-1, (E) 40.3 m s-1,

14. Given that the Earth's radius is 6400 km, the escape velocity at the Earth's surface is (A) 1.1 x 103ms-1, (B) 1.1 x 10*ms-1, (C) 2.2 x 104ms-1, (D) 1.1 X 105 m s-1, (E) 5.0 X 105 m s-1.

16. A circular ring with a diameter of 20 cm and a resistance of 0.01 Ω is subject to a uniform magnetic field of 2.0 T. Calculate the amount of chatge that will flow through the ring when it is rotated from a position perpendicular to the magnetic field to one that is parallel to the field. (A) 3.14 C, (B) 6,.28 C, (C) 2.50 C, (D) 4.62 C, (E) 10 C.

17. A coil with an inductance of 1.5 H and a resistance of 0.6 Ω is suddenly connected to a 12-V battery. Determine the time it takes for the current in the coil to reach 0.63 of its final value. (A) 0.5 s, (B) 1.0 s, (C) 2.5 s,(D) 4 s, (E) 5 s.

18. A particle with charge 9 and mass m is shot with kinetic energy K into the region between two plates as shown in Figure 9. If the magnetic field between the plates is B and as shown, how large must B be if the particle is to miss collision with the opposite plate?(A) B = (2mK)1/2/qd, (B) B = (2mK)1/2/2qd, (C) B=(4mK)1/2/3qd,(D)B=(3mK)1/2/2qd,(E) B=(mK)1/2/qd.

19. In a Hall effect experiment, the cutrent is 2.0 x 10-3 A when 2.0 V is applied to a semiconductor of length 6.0 cm, width 3.0 cm, and depth 0.20 cm. A magnetic field of 2.0 T produces a Hall voltage of 2.0 x 104 V.(A) cutrent density j = 3.3 A/m2, (B) number carrier density 6.0 X 1020/m3, (C) Hall Field EH =6.7x10-4 V/im, (D) resistivity ρ = 1.0 Ωㆍm, (E) All of the above are correct.

20. Maxwell added the concept of displacement curtent into Ampere's law, thereby completing the theory of electromagnetic waves. This modification suggests that equivalent currents can exist even in the absence of real currents under certain circumstances. The modified Maxwell's equations indicate: (A) Static magnetic fields can generate static electric fields. (B) Changing electric fields produce magnetic fields. (C) Static electric fields can generate static magnetic fields. (D) Blectric and magnetic fields are completely independent and do not generate each other. (E) Changing magnetic fields do not produce electric fields.

1.微處理機常以下列哪一個方式評估其執行速度？ (A)MPS(Meter Per Second) (B)BPS(Bit Per Second) (C)MIPS(Million Instruction Per Second) (D)FPS(Frame Per Second)