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Which electrode is placed inside the orifice tube, in coulter counter?

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Which electrode is placed inside the orifice tube, in coulter counter?

(a) Metal electrode

(b) Platinum electrode

(c) Silicon electrode

(d) Magnesium electrode

I had been asked this question in final exam.

This intriguing question comes from Transmission of Video Images in section Telemedicine Technology of Biomedical Instrumentation

1 Answer

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Right choice is (b) Platinum electrode

Easy explanation: In a coulter counter, a platinum electrode is placed inside the orifice tube and a second electrode is submerged into the beaker containing the cell dilution, creating an electrical circuit between the two electrodes.

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