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A person is to be investigated using a magnetic resonance (MR) scanner. This technique involves the use of two superimposed magnetic fields. Describe the functions of these two magnetic fields.
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The first magnetic field is a strong, uniform magnetic field. The magnetic field causes all hydrogen nuclei within the body to align and precess with the same Larmor frequency.
The second magnetic field is a non-uniform (magnetic) field, which enables the nuclei to be located.
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