Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, divided into two sections (called hemispheres) each about 70mm wide. We can model the current in one hemisphere as a circular loop, 65mm in diameter, just inside the brain. The sensor is placed so that it is along the axis of the loop 2.30cm from the center. A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
What is the magnetic field at the center of the hemisphere of the brain?
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, divided...
Magnetoencephalography (MEG) is a technique for measuring changes in the magnetic field of the brain caused by external stimuli such as touching the body or viewing images of food. Such a change in the field occurs due to electrical activity (current) in the brain. During the process, magnetic sensors are placed on the skin to measure the magnetic field at that location. Typical field strengths are a few femtoteslas (1 femtotesla=1 fT=10−15 T) . An adult brain is about 140...
Magnetoencephalography (MEG) is a technique for measuring
changes in the magnetic field of the brain caused by external
stimuli such as touching the body or viewing images of food. Such a
change in the field occurs due to electrical activity (current) in
the brain. During the process, magnetic sensors are placed on the
skin to measure the magnetic field at that location....
Magnetoencephalography (MEG) is a technique for measuring changes in the magnetic field of the brain caused by external...
The magnetic field of the brain has been measured to be approximately 3.0 ×10−12T. Although the currents that cause this field are quite complicated, we can get a rough estimate of their size by modeling them as a single circular current loop 16 cm (the width of a typical head) in diameter. What current is needed to produce such a field at the center of the loop?