What happens when the protons do not have external magnetic field in NMR process?

Related questions

• What is nuclear magnetic resonance (NMR)?
• How does an NMR spectrometer work?
• Why does NMR use deuterated solvents?
• What does an NMR spectrum tell you?
• How was NMR discovered?
• When is NMR used?
• Why is NMR an insensitive technique?
• What physical and chemical properties are determined in atoms or molecules by NMR?
• Why is NMR spectroscopy on large proteins so difficult?
• What are the components of an NMR spectrometers and how does each component work?