Excerpt from The Capacity and Phase Difference of Paraffined Paper Condensers as Functions of Temperature and Frequency
To account for these evidences of a departure from the law of an ideal dielectric (according to which the charge at every moment is proportional to the inst... antaneous value of the impressed voltage) a number of theories of quite varied nature have been proposed, the most important of which will be considered below. Some of these are in qualitative agreement with the observed facts, but are at variance as regards the magnitude of the deviations from a perfect dielectric, while others give equations too complicated to admit of quantitative verification. Further, the great mass of the existing data refers to measurements with a steady emf, and under such a variety of conditions as regards temperature, length of charge, length of discharge, and previous treatment, as to render the task of deciding for or against any given' theory well-nigh impossible.
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