A general relation is derived for the spectral noise density of the ac openhyphen;circuit voltage fluctuations between two point electrodes in a homogeneous conductor with conductivity fluctuations. The conductor is assumed to extend to infinity and a noiseless direct current flows through the conductor via two current electrodes. Besides, the spectral noise density between two point electrodes is calculated for a number of conductors with specified dimensions and specified current electrodes. These theoretical results are compared with experimental results.
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