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In wideline NMR spectrometers, which of the following has to be supplied to the electromagnet?

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In wideline NMR spectrometers, which of the following has to be supplied to the electromagnet?

(a) Slowly varying low voltage

(b) Rapidly varying low voltage

(c) Slowly varying scan voltage

(d) Rapidly varying scan voltage

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Question is taken from Types of NMR Spectrometers in portion Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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The correct choice is (c) Slowly varying scan voltage

The best I can explain: In wideline NMR spectrometers, slowly varying scan voltage has to be supplied to the electromagnet. This is injected using a regulator.

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