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Flat 4-point probe on a circular sample

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gboff21
#1
Mar1-12, 09:01 AM
P: 50
In measuring of the resistance of a superconductor, we are using a four=point probe to determine the voltage. We have a circular sample with a non-negligible thickness and the 4 probes are lying flat on it.
Looking at http://www.fourpointprobes.com/4-point.html, our experiment is the same except that our probes are lying straight across the face of the sample instead of just touching with tips.
Will this affect the equation ρ=π/ln(2) * tV/I?
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