Answer Posted / raghavendran.r
The Above stated answer is true but I would like to add
more to that.there is a technique called as Werner
Configuration Technique where we have in total 4
electrodes.The first and fourth electrode is connected to
Current source and 2nd and 3rd electrode is connected to
voltage source and all 4 are inserted into the earth.And
the data is recorded by a Earth resistivity meter.
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