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Ag-AgCl electrodes are ___________

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Ag-AgCl  electrodes are ___________

(a) polarized

(b) non-polarized

(c) partially polarized

(d) cannot be said

The question was posed to me in an online quiz.

Question is from Silver-Silver Chloride Electrodes topic in section Bioelectric Signal and Electrodes of Biomedical Instrumentation

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The correct option is (b) non-polarized

Easy explanation: The most important and desirable property of the electrodes designed to pick up signals from biological objects is that they should not polarize. This means that the electrodes potential must not vary considerably even when current passes through it. Electrodes made of Ag-AgCl yield acceptable standards of performance.

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