Any magnet generates a magnetic field in the space surrounding it. The direction of the lines of force of this field, defined by the direction of the force exerted by the field on a (hypothetical) single magnetic north pole, is opposite to the direction of field used to magnetize it originally. This discovery in fundamental physics was quickly applied to the magnetic hard-disk technology used for storing data in computers. This lead to a thousand-fold. A magnet is an object or a device that gives off an external magnetic field. Basically, it applies a force over a distance on other magnets, electrical currents, beams of charge, circuits, or magnetic materials. Magnetism can even be caused by electrical currents.
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Q & A: How do magnets work? | Department of Physics | University of Illinois at Urbana-Champaign
Well, i know that moving or spinning charged particles can cause a magnet physics field. But how does it do that?
And why don't stationary charged particles create magnetic fields, even though they create electrostatic forces? And what causes those forces in the magnet physics place? For example, gravity is caused by mass curving or warping space time or something magnet physics the sort, what causes magnetic and electrostatic forces?
What is a Magnet?
magnet physics I know very basic quantum mechanics. Rahul- You're asking just the right questions to start in on Purcell's Electricity and Magnetism book, from the Berkeley series.
The outline of Purcell's presentation looks magnet physics like this. Start with the existence of simple electrostatic forces following Coulomb's law. Look at a moving charge near a neutral, current-carrying wire.
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There's magnet physics electrical force. But magnet physics you now look in the rest frame of the charge, the wire is no longer neutral, thanks to the different Lorentz contractions of the differently-moving plus and minus charges.
So there's an electrical force in this frame.
Magnetism – The Physics Hypertextbook
So there must have been a velocity-dependent force back in the frame where the wire was neutral. We call that velocity-dependent force magnetism. Ok, that magnet physics the part about why magnetism, given electricity.
The part about why electricity in the first place is unfortunately magnet physics my head.
Here's a few words to get you started. Purcell derives the magnetism from electricity from assuming a symmetry, special relativity, a rule about how the world obeys the same laws of physics even as you represent its contents magnet physics different ways.
There are some other subtle symmetries gauge symmetries in relativistic quantum field magnet physics, and I've heard that they require the electrostatic force.
What a neat site. These kids are so smart! Magnet physics comes Peter Peregrinus as he is known in English a. Peter wrote what is commonly known as the Epistole de Magnete or Letter on the Magnet. The carbon in steel causes the precipitation of tiny crystallites of iron carbide in the iron that form what is called magnet physics second phase.
BBC Bitesize - GCSE Physics (Single Science) - Magnets - Revision 1
The phase boundaries between the precipitate particles and the host iron form obstacles to domain wall movement, and thus the coercive force magnet physics remanence are raised compared with pure iron.
The best permanent magnet, however, would be one in which the domain walls were all locked permanently in position and the magnetizations of all the domains were aligned parallel to each other. This situation can be visualized as the result of assembling the magnet from a large number of particles having a high value of saturation magnetization, each of which is a single domain, each having a uniaxial anisotropy in the desired direction, and each aligned with its magnetization parallel to all the others.
Powder magnets The problem of producing magnets composed of compacted powders is essentially that of controlling particle sizes so that magnet physics are small enough to comprise a single domain and yet not so small as to lose their ferromagnetic properties altogether. The advantage of such magnets is that they can readily be molded and machined into desired shapes.