Dr. James C. Garland wrote:
One of the interesting properties of two-dimensional
conductors is that the measured resistance is independent of the spacing
between the probes. In other words, one will get the same measurement on an
ohmmeter if the probes are one centimeter apart as if they are one meter
apart, provided the mat is larger than the probe spacing.
This result may seem counter-intuitive, but it makes sense if you think
about the lines of electic current that flow between the probes.
Can't resist:
http://xkcd.com/356/
Jon LA4RT
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