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Abstract
The non‐linear time variation is considered in the inverse capacitance of an LC circuit and the circuit is analysed to obtain the expression for the charge circulating in the circuit. The results are obtained by the approximation‐free Green's function technique for convolutions and are found to better those obtained by the older theories. In the current or charge expressions, it is found that the sound wave frequencies present in capacity are capable of modulating the resonant frequency of the circuit. These results are of wide application in the theory of radio communication.