9. 10. The ozone molecule has a permanent dipole moment (p). Although the molecule is very slightly bent (which is why the dipole moment exists at all), it can be modeled as a uniform rod of length L with the dipole moment at the center, pointing normal to the long axis. In equilibrium, a dipole aligns with an external electric eld, but suppose that our ozone molecule is rotated by a small angle and released in a uniform E eld. Show that simple harmonic motion occurs, and determine the frequency of these oscillations. (A: I 12 E a) = % .) (Hint: Same idea as in #6; the new thing here is that this is a physical m pendulum problem.) Consider a conguration of two electric dipoles situated backtoback on the zaxis. Find the electric eld a distance 2 from the middle of the two dipoles, such that 2 >> 0?. + + .41\" 4