Liquid crystals are characterized by an orientational order of the rod-like (or possible disk-like) molecules of which they are composed. The anisotropic part of the molecular diamagnetic susceptibility gives rise to a coupling between external magnetic fields and the orientational structure. In terms of the Frank elasticity theory we discuss several such effects of a static field, e.g. unwinding of a cholesteric helix, Freedericksz transition. The second part of this review is devoted to a consideration of magnetic resonance as a tool to study both the order parameter and the orientational fluctuation modes in a liquid crystal.
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P. Pincus (1970) studied this question.
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