12. A conducting sphere is charged with a total charge Q (Q ＞ 0) and in electrostatic equilibrium. Which of the following statement is true? (The electric potential at infinity is defined zero.)
(A) The potential is the lowest, but not zero, at the center of the sphere.
(B) The potential at the center of the sphere is zero.
(C) The potential at the surface is higher than the potential at the center.
(D) The potential at the center is the same as the potential at infinity.
(E) The potential at the center of the sphere is the same as the potential at the surface.

13. A particle of mass m and charge q is circling on an orbit of radius R normal to an external magnetic field Bext. This moving charge would create a new magnetic field. What is this new magnetic field at the center of the orbit? (A) (B)(C)(D)(E) None of the above.

14. What is the time constant τ for the combination shown in the figure? (A) 3RC/8 (B) 3RC/4 (C) 4RC/3 (D) 8RC/3 (E) None of the above.

15. A long conductive rod of radius R carries a nonuniform current density J(r) = J₀r/R, where J₀ is a constant and r is the radial distance form the rod axis. What is the expression for the magnetic field strength inside this rod? (A) μ₀J₀r (B) μ₀J₀r²/3R (C) μ₀J₀r²/R (D) μ₀J₀r²/5R (E) None of the above.

16. Suppose the magnetic field ( B ) in a plane electromagnetic (EM) wave is given by B = Byĵ, where By = 2×10⁻⁷sin(0.5×10³x + 1.5×10¹¹t) Tesla, ĵ is the unit vector along the y direction, and the SI unit is adopted. What is the expression for the electric field vector E(x,t) (in the SI unit) of this EM wave? (A) 60sin(0.5×10³x + 1.5×10¹¹t) î, where î is the unit vector along the x direction. (B) -60sin(0.5×10³x + 1.5×10¹¹t) î, where î is the unit vector along the x direction. (C) 60sin(0.5×10³x + 1.5×10¹¹t) k̂, where k̂ is the unit vector along the z direction. (D) -60sin(0.5×10³x + 1.5×10¹¹t) k̂, where k̂ is the unit vector along the z direction. (E) None of the above.

17. The reason why viruses can be seen using electron microscope is that the wavelength of electron can be smaller than the size of viruses. Assume an electron microscope has an accelerating voltage of 40 kV. What is the wavelength of the electron? (A) 0.006 nm (B) 0.003 nm (C) 0.06 nm (D) 0.03 nm (E) 0.6 nm.

18. Two rockets A and B are approaching the Earth from opposite directions, each moving at 0.80c relative to the Earth, as shown in the figure. How fast do the spaceships move relative to each other? (A) 0.48c (B) 0.80c (C) 0.98c (D) 1.3c (E) 1.6c.

19. Positronium consists of an election and a positron (a positive electron) orbiting about their common center of mass. According to the Bohr model, what is the expression of the energy level of a positronium? (A) En = -3.4 eV/n² (B) En = -6.8 eV/n (C) En = -6.8 eV/n² (D) En = -13.6 eV/n² (E) En = -13.6 eV/n

20. The fact that light can be polarized indicates which of the following? (A) Polarized light travels faster than non-polarized light. (B) Polarized light is monochromatic. (C) Light travels with a constant speed regardless of the reference frame. (D) Light is longitudinal wave. (E) Light is transverse wave.

1. A particle of mass m =100 g moves straight forward under an acceleration a(t) = 2 + t² (m/s²). If the particle starts at rest, what is the magnitudes of the momentum of the particle at t = 3 sec? (A) 0.2 kg-m/s (B) 0.5 kg-m/s (C) 1.1 kg-m/s (D) 1.5 kg-m/s (E) 2 kg-m/s

2. A circular object of mass m and of radius R rolls smoothly (without sliding) along a frictional incline, as shown in the right figure. In the following, which type of the object will roll with the highest acceleration? (A) A ring (Rotational inertia about the center of mass Icm = mR²) (B) A solid sphere (Icm = 2mR²/5) (C) A spherical shell (Icm = 2mR²/3) (D) A disk (Icm = mR²/2) (E) The same.

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