On the influence of shape and variations in conductivity of the sample on four-point measurements
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The influence of the finite size of the sample and of variations in conductivity through the sample on the voltage-current ratio found by fourpoint measurements is investigated. Expressions for this ratio are found for samples of infinite length and with rectangular or semi-circular cross-section. In the first case the influence of a finite length and of an exponential variation of the conductivity along the axis of the sample is examined. A chart showing the correction factor for a bar of rectangular cross-section is presented.
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