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 ...
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...
a common mineral in Earth’s crust, which were extracted from a 591-million-year-old rock formation in Brazil. Plagioclase crystals contain tiny magnetic minerals that preserve the intensity of the Earth’s magnetic field at the time they are formed. Analysis of the crystals showed that, at t...
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 ...
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...
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.
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 ...
Dense material sank to the protoplanet's center while lighter material built up the crust. Earth's magnetic field is thought to have likely formed around this time. Early in its evolution, Earth suffered an impact by a large body that catapulted pieces of the young planet's mantle into ...
How is a beta particle formed?Beta ParticlesBeta Particles are high energy electrons or positrons that are traveling at high speed. This is a form of ionizing radiation that is considered more dangerous than Alpha particles but less dangerous than Gamma rays....
A magnet is an object formed out of any type of material that can produce its own magnetic field. Such materials include hard magnets and soft magnets. Examples of hard magnets are neodymium magnets and refrigerator magnets which always remember the way in which they were magnetized.Examples of...