Discussion
The earth tester works on the principle of ___________.
Answer: A
The earth tester works on the principle of the fall of potential method. A current is sent through the earth electrode to an auxiliary electrode, and the potential drop between the earth electrode and a second auxiliary electrode is measured, from which the earth resistance is found.
Kirchhoff's current and voltage laws are general laws of circuits, and the rise of potential method is not the one used. So the first option is correct.
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