Exam-style question
Try this first
What is the effect of a strong magnetic field in MRI?.
- A.It increases the speed of sound in tissues.
- B.It aligns the magnetic moments of hydrogen nuclei.
- C.It reduces the energy levels of electrons.
- D.It enhances the absorption of ionising radiation.
Model answer
What a good answer should say
- It aligns the magnetic moments of hydrogen nuclei.
Explanation
Why this works
A strong magnetic field in MRI aligns the magnetic moments of hydrogen nuclei, which is essential for the subsequent excitation and signal detection during imaging.
Common mistake
No common mistake is linked to this question yet.