L9-page2 - ∆ V This lead to use of four electrode array...

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2 • 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 measure potential difference (
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Unformatted text preview: ∆ V) . This lead to use of four electrode array for each measurement. Measurement Practicalities Resulting measurement given as Can be rewritten where G*/2 π is sometimes referred as the Geometrical Factor ρ π ρ = ∆ 2 G I V * ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + − − π ρ = − = ∆ 4 3 2 1 2 P 1 P r 1 r 1 r 1 r 1 2 I V V V...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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