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Which of the following is used as a coolant for magnets in continuous-wave NMR spectrometer?

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Which of the following is used as a coolant for magnets in continuous-wave NMR spectrometer?

(a) Water

(b) Liquid He

(c) Liquid Na

(d) Heavy water

This question was posed to me in an interview for internship.

This intriguing question comes from Types of NMR Spectrometers in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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Correct option is (a) Water

Explanation: Water is used as a coolant for magnets in continuous-wave NMR spectrometer. Liquid He is used for FT-NMR spectrometers.

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