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Topic: Magnetism


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In the News (Sun 21 Apr 19)

  
  magnet
The crystals are used as magnetic "surveyor's spirit levels" that ensure that nests are aligned correctly and do not become lopsided, as it is believed that the crystals help the hornets to assess the symmetry and balance of the cells by comparing the magnetic field with the gravitational field.
Powerful magnetic fields in the vicinity of a television or monitor can distort the image and in some cases permanently magnetise the tube which leads to coloured patches on the screen and the tube must then be demagnetised or degaussed.
The magnetic history of the Earth as recorded in rocks in the various continents is the same but the the orientation of the magnetic information in the different continents is different thus indicating that the continents have moved over the Earth's surface.
www.newi.ac.uk /buckleyc/magnet.htm   (0 words)

  
  magnetism — FactMonster.com
electromagnet - electromagnet electromagnet, device in which magnetism is produced by an electric current.
pole, in electricity and magnetism - pole pole, in electricity and magnetism, point where electric or magnetic force appears to be...
magnetic flux - flux, magnetic flux, magnetic, in physics, term used to describe the total amount of magnetic field...
www.factmonster.com /ce6/sci/A0831162.html   (115 words)

  
  Magnetism - Wikipedia, the free encyclopedia
Normally, magnetic fields are seen as dipoles, having a "South pole" and a "North pole"; terms dating back to the use of magnets as compasses, interacting with the Earth's magnetic field to indicate North and South on the globe.
Alnico magnets are made by casting or sintering a combination of aluminium, nickel and cobalt with iron and small amounts of other elements added to enhance the properties of the magnet.
Flexible magnets are similar to injection molded magnets, using a flexible resin or binder such as vinyl, and produced in flat strips or sheets.
en.wikipedia.org /wiki/Magnetism   (1935 words)

  
 Magnetism - MSN Encarta
Magnetic forces are produced by the motion of charged particles such as electrons, indicating the close relationship between electricity and magnetism.
At the ends of the magnet, where the flux lines are closest together, the magnetic field is strongest; toward the side of the magnet, where the flux lines are farther apart, the magnetic field is weaker.
Magnetic fields are used to change the paths of charged particles in devices such as particle accelerators and mass spectrometers.
encarta.msn.com /encyclopedia_761552678/Magnetism.html   (1178 words)

  
 magnetism - Hutchinson encyclopedia article about magnetism   (Site not responding. Last check: )
The well-known properties of a magnet, and the fact that the Earth is a magnet, were explained by the Elizabethan scientist William Gilbert, ‘the father of magnetic philosophy’.
The character of a magnetic field – the region of magnetic attractions and repulsions around a magnet – was investigated by Michael Faraday.
All substances are magnetic to a greater or lesser degree, and their magnetic properties, however feeble, may be observed when they are placed in an intense magnetic field.
encyclopedia.farlex.com /magnetism   (1022 words)

  
 Physics Demonstrations - Magnetism
The reason the ball is ejected is that the magnetic field decreases radially outward from the axis, and thus the ball rests in a magnetic well for motion along the axis, but it rests unstably at the top of a magnetic hill for motion perpendicular to the axis.
A permanent magnet is brought near a cathode ray tube causing a distortion of the pattern on the fluorescent screen to illustrate the effect of a magnetic field on moving charged particles.
The magnetic field produced by the coil is proportional to the number of ampere-turns in the coil which is given by NV(C/L), where N is the number of turns, V is the capacitor voltage, C is the capacitance and L is the inductance of the coil and its leads back to the capacitor.
sprott.physics.wisc.edu /demobook/chapter5.htm   (3955 words)

  
 Magnetism   (Site not responding. Last check: )
Magnetism is the force where objects are attracted or repelled to one another.
The larger the magnet and the closer the object to the magnet, the greater the force of the magnetic field.
The term magnetism is derived from Magnesia, the name of a region in Asia Minor where lodestone, a naturally magnetic iron ore, was found in ancient times.
www.mcwdn.org /Physics/Magnetism.html   (339 words)

  
 Exploratorium: Science Snacks About Magnetism
A grape is repelled by both the north and south poles of a strong rare-earth magnet.
A magnet exerts a force on a current-carrying wire.
The attraction and repulsion of magnets produces entrancing, unpredictable motion.
www.exploratorium.edu /snacks/iconmagnetism.html   (138 words)

  
 Magnetism Theme Page
Magnetic Fields and Bermuda Triangles High school students can use this activity to learn how to map a magnetic field and to find how magnetic fields can combine to form a complex resultant field.
Magnets An introduction to magnets for primary students.
MagLev (magnetic levitation) technology is the concept underlying research into the use of magnets to propel trains.
www.cln.org /themes/magnetism.html   (0 words)

  
 Magnetism - Succeed in Physical Science: School for Champions
Magnetism is a force that acts at a distance due to a magnetic field.
When a magnetic field is applied to a moving electric charge, such as a moving proton or the electrical current in a wire, the force on the charge is called a Lorentz force.
Magnetism is a force that acts at a distance and is caused by a magnetic field.
www.school-for-champions.com /science/magnetism.htm   (812 words)

  
 Canada Science and Technology Museum   (Site not responding. Last check: )
Magnets can be made by placing a magnetic material such as iron or steel, in a strong magnetic field.
If a magnetic material is placed in a strong magnetic field, the individual domains, which normally point in all directions, gradually swing around into the direction of the field.
Magnetite is magnetic because its molecular structure has allowed it to retain the alignment of particles caused by the Earth's magnetic field during its formation millions of years ago.
www.sciencetech.technomuses.ca /english/schoolzone/Info_Magnets.cfm   (1654 words)

  
 Magnetism
Magnetism is basically the property of an object being able to attract another object.
To be a magnetic substance a substance must have a North pole and a South pole naturally.
If you have an iron magnet and a nickel nail (which is a magnetic substance, but does not experience a magnetic field) that nail will become attracted to the magnet.
library.thinkquest.org /11924/emagnet.html   (629 words)

  
 electricity and magnetism   (Site not responding. Last check: )
We are familiar with electricity and magnetism through the interaction of compasses with the earth's magnetic field, or through fridge magnets or magnets on children's toys.
A connection between electricity and magnetism was discovered (accidentally) by Orsted over 100 years ago, who noticed that a compass needle is deflected when brought into the vicinity of a current carrying wire.
The direction of these induced magnetic fields are such that if one is externally increasing the magnetic field through the loop by pushing a magnet in, then the induced field will be such as to decrease the magnetic field through the loop; this is indicated in the previous figure.
www.electricityforum.com /electricity-and-magnetism.html   (1245 words)

  
 Exploratorium: Science Snacks: Circles of Magnetism I
Because opposite magnetic poles attract, the magnetic north pole of the compass points toward the magnetic south pole of the earth.
The electric current passing through the wire creates a magnetic field that is stronger than the earth's field (in a region close to the wire).
Since the magnetic field from the wire is significantly larger than that from the earth, each needle ends up pointing essentially in the direction of the magnetic field of the wire.
www.exploratorium.edu /snacks/circles_magnetism_I.html   (834 words)

  
 Magnetism
  In nature, magnetic fields are produced in the rarefied gas of space, in the glowing heat of sunspots and in the molten core of the Earth.
Fi   eld lines of a bar magnet are commonly illustrated by iron filings sprinkled on a sheet of paper held over a magnet.
A map of the magnetic field lines of the magnetosphere, like the one displayed above (from a mathematical model of the field), tells at a glance how different regions are linked and many other important properties.
www-spof.gsfc.nasa.gov /Education/Imagnet.html   (1035 words)

  
 Magnetic Fields
A magnetized bar has its power concentrated at two ends, its poles; they are known as its north (N) and south (S) poles, because if the bar is hung by its middle from a string, its N end tends to point northwards and its S end southwards.
The Earth's own magnetic powers arise deep in its interior, and temperatures there are too high for iron magnets, which lose all their power when heated to a red glow.
In fact, some of the world's strongest magnets contain no iron, because the added benefit of iron inside an electromagnet has a definite limit, whereas the strength of the magnetic force produced directly by an electric current is only limited by engineering considerations.
www-istp.gsfc.nasa.gov /Education/wmfield.html   (696 words)

  
 ScienceMaster - JumpStart - Magnetism
In nature, magnetic fields are produced in the rarefied gas of space, in the glowing heat of sunspots and in the molten core of the Earth.
Field lines of a bar magnet are commonly illustrated by iron filings sprinkled on a sheet of paper held over a magnet.
Faraday not only viewed the space around a magnet as filled with field lines, but also developed an intuitive (and perhaps mystical) notion that such space was itself modified, even if it was a complete vacuum.
www.sciencemaster.com /jump/earth/magnetism.php   (1046 words)

  
 Understanding the Sun   (Site not responding. Last check: )
Magnetism, or magnetic field, is produced on the Sun by the flow of electrically charged ions and electrons.
However, we usually measure the magnetic field itself in the photosphere, the innermost layer of the Sun's atmosphere.
Observations of magnetic fields associated with solar flares show that flares are likely to occur when the magnetic field lines linking two sunspots become sheared or twisted.
science.nasa.gov /ssl/pad/solar/the_key.htm   (455 words)

  
 Magnet and magnetism news and more
According to their website, this company "deploys vast magnetic forces to punch precision traversable wormholes through the spacetime foam".
Able to produce a magnetic field of 88 tesla, the machine is expected to reach 100 Tesla.
Roll one ball into the magnet and a knock-on effect adds force until the projectile is shot into whatever direction it's pointed (hopefully not into your eye).
www.magnetism.com   (917 words)

  
 BBC - Radio 4 In Our Time - Magnetism
The big ideas which form the intellectual agenda of our age are illuminated by some of the best minds.
The nails of his sandals held fast to the rock beneath them, and the iron tip of his crook was strangely attracted to the boulders all around.
Magnes had stumbled across the lodestone, or 'Magnetite', and discovered the phenomenon of magnetism.
www.bbc.co.uk /radio4/history/inourtime/inourtime_20050929.shtml   (281 words)

  
 Chapter 1: Magnetism
If the distance is too far, the magnet will jump from the bottom to the top, or fall from the top to the bottom, instead of floating between the disks in mid-air.
Right at the critical point, where the magnetic pull just barely counteracts gravity, the weak diamagnetism of the bismuth is enough to keep the magnet from jumping up to the ring magnets, or falling down.
The magnetic field is bigger and spreads out more, and so the floating magnet can move up and down more before the strength of the field changes enough to make it fly up or fall down.
www.scitoys.com /scitoys/scitoys/magnets/suspension.html   (1578 words)

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