Three general types of magnets exist: permanent magnets, temporary magnets and electromagnets. Permanent magnets retain their magnetic quality over long periods of time. Temporary magnets lose their magnetism quickly. Electromagnets use electric current to generate a magnetic field. Permanent Magnets Permane...
Electromagnets are generally safe for their various uses, but you need to take precautions depending on the context in which you use them. Very, very powerful magnets and electromagnets that come into contact with or incloseproximity to laptops or computers can damage their hard drives, but, for...
What are electromagnets used for? Give an example of a physical quantity having neither unit nor magnitude. State and define the SI unit of power. What countries use both metric and non-metric system? What is the unit of sqrt(mu/epsilon)?
What are electromagnets used for? How does the magnet attract something that is originally non magnetic? Describe how the magnetic domains in an unmagnetized iron rod will respond to the presence of a strong external magnetic field. a. The domains will split into monopoles. b. The domains will...
They are made of iron oxide. They are weaker thanneodymium magnets. They are resistant to demagnetization. They are strong and durable. They are tough to alter. Ferrite Magnets possess strong magnetic fields just like other electromagnets, however, they do not require an electrical force to produ...
inside of a magnetic field. When the magnetic field is removed, the object remains magnetized. Permanent magnets have a permanent magnetic field and do not turn on and off like electromagnets do. Permanent magnets are the oldest type and are still used for a wide variety of applications today...
Ordinary (optical) microscopes use a series of glass lenses to magnify tiny objects, while super-powerful electron microscopes use electromagnets to bend electron beams that help us see in even more detail. Movie projectors and projection televisions use lenses to convert small movie pictures into ...
A bar magnet is a rectangular piece of an object that shows permanent magnetic properties and are made from the ferromagnetic substance. Cylindrical and rectangular bar magnets are the types of bar magnet. They are used in educational institutes.
Specimens are cut into extremely thin sections, and the transmission electron microscope aims an electron beam through a section, just as a light microscope aims a beam of light through a specimen. However, instead of lenses made of glass, the transmission electron microscope uses electromagnets as...
How Electromagnets Work How does gravity assist work with interplanetary satellites? Where do bullets go when guns are fired straight up into the air? More Great Links Bending Spacetime in the Basement (how to repeat the Cavendish Experiment to calculate the gravitational constant G) Science Daily:...