Q9 (NDA-I/2013) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Atomic and nuclear physics Answer Verified

Magnetic Resonance Imaging (MRI) is used in medical diagnosis to obtain images of our internal body organs. This is primarily possible because

our body possesses a permanent magnet

MRI uses an external magnet to generate a magnetic field in our body

MRI uses an external electric field to generate magnetic field in our body

ions motion along our nerve cells generates magnetic fields

Result

Your answer: — · Correct: D

Explanation

Magnetic Resonance Imaging (MRI) relies on the magnetic properties of the human body. While the body is not a permanent magnet, it contains weak ion currents traveling along nerve cells that produce temporary magnetic fields [1]. More significantly, the body is abundant in hydrogen nuclei (protons), which behave like tiny bar magnets due to their nuclear spin [4]. Under normal conditions, these protons are randomly aligned. However, when a patient is placed in an MRI scanner, a powerful external magnetic field forces these protons to align with the field. By applying radiofrequency pulses, these protons are stimulated and subsequently release energy as they realign, allowing sensors to detect signals and construct detailed images of internal organs. Thus, the fundamental physical basis for MRI is the magnetic field generated by the motion of ions and the intrinsic magnetic properties of nuclei within the body.

Sources

[1] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > Magnetism in medicine > p. 204
[4] https://www.sciencedirect.com/topics/nursing-and-health-professions/nuclear-magnetic-resonance-imaging

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Magnetic Resonance Imaging (MRI) is used in medical diagnosis to obtain images of our internal body organs. This is primarily possible because

Explanation

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