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# L8-page7 - measure potential difference ∆ V This lead to...

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7 • Why run an electrode to infinity when we can use it? source sink P V source = i ρ 2 π r source r source sink k sin r 2 i V π ρ = r sink Total Voltage at P: π ρ = = ink s source k sin source p r 1 r 1 2 i V V V Two Current Electrodes: Source and Sink Can’t measure potential at single point unless the other end of our volt meter is at infinity. This is inconvenient. It is easier to
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Unformatted text preview: measure potential difference ( ∆ V) . This lead to use of four electrode array for each measurement. Measurement Practicalities Resulting measurement given as ∆ V=V P1-V P2 = ρ I/(2 π )*(1/r 1-1/r 2-1/r 3 +1/r 4 ). Can be rewritten ∆ V= ρ I*G/(2 π ) where G/2 π is the Geometrical Factor of the array. ρ...
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