How can brain activation produce a magnetic field?

Answer 1

Any material that can conduct electricity can produce a magnetic field. The brain uses tinny amounts of electricity to move messages around itself so the brain produces a very small magnetic field that Medical Doctors using very sensitive equipment may be able to detect

Answer 2

When neurons in the brain communicate with each other, they create small electrical currents. These currents generate a magnetic field according to Maxwell's equations. By using techniques like magnetoencephalography (MEG), scientists can detect and map these magnetic fields to study brain activity.