Physics · Electrical Measuring Instruments
In an Earth Tester, alternating current is used instead of direct current mainly to:
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- 1Avoid errors due to electrolytic and polarization effects in the soil during resistance measurement✓
- 2Ensure the potential gradient remains constant over the distance between electrodes
- 3Reduce inductive reactance between the electrodes and the soil medium
- 4Increase the sensitivity of the instrument by enhancing current through the earth electrode
Correct answer
Avoid errors due to electrolytic and polarization effects in the soil during resistance measurement
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