15. A capacitor of capacitance Ci is charged to a potential difference V. The terminals of the charged capacitor are then connected to those of an uncharged C₂ capacitor. Which statement is correct for this procedure?
(A) The original charge of the system is C₁V；
(B) The final potential difference across each capacitor is C₁ V/ (C₁ + C₂)；
(C) The total electrical energy of the system decreases when the two capacitors are connected；
(D) All；
(E) None.

16. The potential difference across the terminals of a battery is V1when there is a current of I1 in the battery from the negative to the positive terminal. When the current is Iz in the reverse direction, the potential difference becomes V.. (Note that V1, V2, I1 and I2 are all defined as positive values)Which statement is not correct for this system? (A) V1 = V2； (B) The internal resistance of the battery is (V2 - V1)/( I1 + I2)； (C) The enf of the battery is ( I1V2 +  I2V1 )/(I1 + I2)； (D) All； (E) None.

17. Adc motor with its rotor and field coils connected in series has an internal resistance of R. When the motor is running at full load on a supply of V, the emf in the rotor is . Which statement is not correct for this system?(A) The current drawn by the motor from the supply is (V-ε )/R； (B) The power delivered to the motor is V(V-ε )ε/R； (C) The mechanical power developed by the motor is (V-ε) ε /R； (D) All； (E) None.

18. A slender metal rod of length L rotates with an angular speed of ω about an axis through one end and perpendicular to the rod. The plane of rotation of the rod is perpendicular to a uniform magnetic field with a magnitude of B. Which statement is not correct for this system? (A) The induced emf in the rod is ωBL2 ； (B) The potential difference between its ends is ωBL2/2 ； (C) The induced emf in the rod is equal to the potential difference between its ends； (D) All； (E) None.

19. Which is not an appropriate pair of analogy between mechanical and electrical quantities of the oscillating systems?(A)vI；(B)kC；(C)mL；(D) FV；(E) None. (k = spring constant)

20. An electromagnetic wave has an electric field given by E(y,t) = E0 k cos(ky -ωt). Which statement is not correct?(A) The wave is traveling in (+y) direction； (B) It is polarized along x-direction； (C) B(y,t) =(E0/c) i cos(k y - ωt)； (D) All； (E) None.

21. Which is necessary for two sources of waves to be "coherent"?(A) They are "in phase"； (B) They have the same amplitude； (C) They have the same frequency； (D) All；(E) None.

22. The image of a real object produced by a convex mirror is (A) virtual； (B) erect； (C) reduced； (D) All； (E) None.

23. Which quantity of the electron in a hydrogen atom is a constant multiplied by an integer in Bohr's model? (A) Linear momentum； (B) Angular momentum； (C) Binding energy； (D) All； (E) None.

24. An electron is accelerated by a voltage from rest until the wavelength of its matter wave is λ.What is the accelerating voltage V ?(A) h2/(2meλ2)；(B) h2(meλ2)； (C) h2/(2meλ)； (D) h(2meλ2)； (E) None. (h = Planck's constant)

25. Which behavior in the "photoelectric effect" can also be explained by the wave theory of light? (A) There is a "threshold frequency" for the incident light；(B) The "stopping potential" is not dependent on the intensity of light； (C) The "photocurrent" is proportionl to the intensity of light； (D) All. (E) None.

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