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Unformatted text preview: (Eq.2) where L is the length of the sample (along which the electric field is applied). We also know that the current density, J is related to the total current, I, by, J = I/A (Eq.3) where A is the area of the sample (through which the current flows). Finally, we know that the resistance, R is given by A L A L R σ ρ = = (Eq.4) where the resistivity, ρ , is the reciprocal of the conductivity, σ . Substitute Eq. 2,3,4 in Eq. 1 (Ohms law) to get J = σ E...
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This document was uploaded on 12/10/2009.
 Spring '07

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