17. During this process, (A) the internal energy of the air considered decreases (B) the internal energy of the air increases (C) the air volume expands (D) the air pressure drops down (E) none of the above happens.

10. An electric dipole consists of two opposite charges, each with mass m and charge ±q (respectively), and the two charges are separated by a distance d. Under a uniform external electric field E, the electric dipole performs simple harmonic oscillation if the angle between the dipole and E is small. The period of this oscillation is (A) (B) (C) (D)(E) none of the above.

17. During this process,
(A) the internal energy of the air considered decreases
(B) the internal energy of the air increases
(C) the air volume expands
(D) the air pressure drops down
(E) none of the above happens.

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