While the main magnet creates an intense, stable magnetic field around the patient, the gradient magnets create a variable field, which allows different parts of the body to be scanned. Another part of the MRI system is a set of coils that transmit radiofrequency waves into the patient's ...
If you pass an electric current through the wire, a magnetic field is formed in the iron bar, and it becomes a magnet, with definite north and south poles. Turn off the current, and the magnetic properties disappear. By themselves, electromagnets are useful things. You can use them to ...
While tracking down carbon dioxide in the atmosphere, Marty's team is also examining the presence of the gas in ancient continental crust. As the crust formed, topography forced carbon dioxide in the atmosphere to come down as acid rain. As the carbon dioxide entered the crust, it then flowe...
If you pass an electric current through the wire, a magnetic field is formed in the iron bar, and it becomes a magnet, with definite north and south poles. Turn off the current, and the magnetic properties disappear. By themselves, electromagnets are useful things. You can use them to ...
magnetic field at the time they are formed. Analysis of the crystals showed that, at their point of formation, the Earth’s magnetic field was the weakest ever recorded — some 30 times weaker than both the current magnetic field intensity, and that measured from similar crystals formed ...
simplest form, this consists of an iron bar wrapped in a coil of wire. If you pass an electric current through the wire, a magnetic field is formed in the iron bar, and it becomes a magnet, with definite north and south poles. Turn off the current, and the magnetic properties ...
The magnetic field sensor in order to measure at least one component of the magnetic field, the ferromagnetic core -(4) and the exciting coil which are useful as a magnetic field collector (3) and is formed from the reading sensor (5). The reading sensor (5) is arranged if possible ...
The easiest way to create a powerful magnetic field is by creating a powerful electromagnet. Electromagnets are used for everything from powering tiny electronic switches (called relays) to lifting huge pieces of scrap metal.
To make a permanent magnet, all you have to do is encourage the magnetic domains in a piece of metal to point in the same direction. That's what happens when you rub a needle with a magnet — the exposure to the magnetic field encourages the domains to align. Other ways to align magn...
In this process called magnetorotational instability magnetic fields can be strongly amplified. How giant magnetic fields are formed The GATE experiment is a successor to the award-winning "PROMISE" experiment which, in 2010, proved the existence of so-called magnetorotational instability (MRI), demo...