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For a polarity check, which electrode can be utilized?

  1. Carbon

  2. Tungsten

  3. Aluminum

  4. Steel

The correct answer is: Carbon

A carbon electrode is the most suitable for polarity checks because it has a high melting point and does not easily react with other materials. This allows it to maintain its stability and accuracy during the polarity check process. Tungsten, aluminum, and steel electrodes are not suitable for polarity checks as they have lower melting points and are more reactive, which can affect the accuracy of the results.