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Which of the following concepts are not used in magnetic wind instruments?

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Which of the following concepts are not used in magnetic wind instruments?

(a) Change in resistance due to cooling by magnetic wind

(b) Displacement of membrane by magnetised oxygen

(c) Difference in pressure difference between two gases having varying concentration of oxygen

(d) By measuring temperature using thermometer

I have been asked this question in a national level competition.

This intriguing question originated from Magnetic Wind Instruments topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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The correct option is (d) By measuring temperature using thermometer

Explanation: Temperature is not measured in magnetic wind instruments. The cooling effect of magnetic wind causes a change in resistance which is measured.

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