  We have studied magneto-optical effects in an optical whispering-gallery-mode
resonator (WGMR) manufactured from a Faraday-rotator material with, to the best
of our knowledge, the record quality factor ($Q = 1.45\times10^8$) achieved for
such materials. We have experimentally measured the eigenfrequencies deviation
amplitude under the application of an external magnetic field and demonstrated
the polarization plane declination over the light path. An analytical model for
arbitrary magnetic field geometries in magneto-optic birefringent WRMRs has
been developed.
