An electric current always produces a magnetic field. Even weak ion currents that
travel along the nerve cells in our body produce magnetic fields. When we touch
something, our nerves carry an electric impulse to the muscles we need to use. This
impulse produces a temporary magnetic field. These fields are very weak and are about
one-billionth of the earth’s magnetic field. Two main organs in the human body where
the magnetic field produced is significant, are the heart and the brain. The magnetic field
inside the body forms the basis of obtaining the images of different body parts. This is
done using a technique called Magnetic Resonance Imaging (MRI). Analysis of these
images helps in medical diagnosis. Magnetism has, thus, got important uses in medicine.
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