14. A planet is rotating about the sun in an elliptic orbit. If its speed at the perihelion (point I) is v, what is its speed at point II? (A) (B) (C) [(a − b)/b]v (D) [(a + b)/b]v (E)

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.

14. A planet is rotating about the sun in an elliptic orbit. If its speed at the perihelion (point I) is v, what is its speed at point II?

(A)
(B)
(C) [(a − b)/b]v
(D) [(a + b)/b]v
(E)

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