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In Paramagnetic oxygen analyzer, the expression for magnitude of force produced can be expressed as, F = C (K-KO), where K= magnetic susceptibility of surrounding gas and KO= magnetic susceptibility of sphere. C denotes which of the following?

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In Paramagnetic oxygen analyzer, the expression for magnitude of force produced can be expressed as, F = C (K-KO), where K= magnetic susceptibility of surrounding gas and KO= magnetic susceptibility of sphere. C denotes which of the following?

(a) Magnetic field strength

(b) Magnetic gradient

(c) Function of magnetic field strength and gradient

(d) Magnetic flux

This question was addressed to me during an interview for a job.

My doubt stems from Paramagnetic Oxygen Analyser topic in division Industrial Gas Analysers of Analytical Instrumentation

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Correct choice is (c) Function of magnetic field strength and gradient

The explanation: In the expression for magnitude of force, C denotes the function of magnetic field strength and gradient. The forces are thus a measure of magnetic susceptibility and hence of oxygen.

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