In a three-point (fall-of-potential) earth resistance measurement, why must the potential electrode be placed at a suitable distance from both the earth electrode under test and the current electrode?

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Physics · Electrical Measurements

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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To ensure an undisturbed potential gradient region around the electrode under test

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Answer 1

To ensure an undisturbed potential gradient region around the electrode under test

Answer 2

To reduce contact resistance at the electrode surface

Answer 3

To simplify physical placement during measurement

Answer 4

To minimize mechanical damage to the electrodes

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