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Generally what is the material of needle electrodes?

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Generally what is the material of needle electrodes?

(a) stainless steel

(b) copper

(c) lead

(d) iron

This question was posed to me in my homework.

I would like to ask this question from Electrodes for EMG in division Bioelectric Signal and Electrodes of Biomedical Instrumentation

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The correct option is (a) stainless steel

To explain: The material of the needle electrode is generally stainless steel. In spite of the face that stainless steel is unfavorable electrode material from the point of view of noise, it is preferred in EMG work. It is due to its mechanical solidity and low price.

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