81. Magnetic Force: Definition And Much More From Answers.com Thus, magnetism is seen whenever electrically charged particles are in motion . A magnetic field contains energy, and physical systems will stabilize http://www.answers.com/topic/magnetism-1

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Dictionary WordNet Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping magnetic force Dictionary magnetic force n. The force exerted between magnetic poles, producing magnetization. A force that exists between two electrically charged moving particles. var tcdacmd="cc=edu;dt"; WordNet Note: click on a word meaning below to see its connections and related words. The noun magnetic force has one meaning: Meaning #1 attraction for iron; associated with electric currents as well as magnets; characterized by fields of force Synonyms: magnetism magnetic attraction Wikipedia magnetism In physics magnetism is a phenomenon by which materials exert an attractive or repulsive force on other materials. Some well known materials that exhibit easily detectable magnetic properties are iron , some steels , and the mineral lodestone ; however, all materials are influenced to one degree or another by the presence of a magnetic field , although in most cases the influence is too small to detect without special equipment.

82. Magnetic Pole: Definition And Much More From Answers.com Either of two limited regions in a magnet at which the field of the magnet is The best hypothesis to date for the origin of terrestrial magnetism is the http://www.answers.com/topic/magnetic-pole

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Dictionary Encyclopedia Science Electronics WordNet Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping magnetic pole Dictionary magnetic pole n. Either of two limited regions in a magnet at which the field of the magnet is most intense, each of which is designated by the approximate geographic direction to which it is attracted. Either of two variable points on the earth, close to but not coinciding with the geographic poles, where the magnetic field of the earth is most intense and toward which the needle of a compass points. var tcdacmd="cc=edu;dt"; Encyclopedia magnetic pole, the two nearly opposite ends of the planet where the earth's magnetic intensity is the greatest, as the north and south magnetic poles. For the magnetic north, it is the direction from any point on the earth's surface linking the horizontal component of the magnetic lines of force with the observer and north magnetic pole; it is similar for magnetic south. The north magnetic pole, first located (1831) by English explorer Sir James C. Ross, is now about 78°N and 104°W in the Queen Elizabeth Islands of northern Canada. The south magnetic pole, reached (1909) by English geologists Sir T. W. E. David and Sir Douglas Mawson, is now about 66°S and 139°E on the Ad©lie Coast of Antarctica. The magnetic poles are not fixed but follow circular paths with diameters of about 100 miles (160 km). Studies of

83. Teaching About The Earth's Magnetism In Earth Sciences--Part 3 Its magnetism is weak, but lava in general comes out in huge masses, so that itshows The first person to devise a method of analyzing the Earth s field http://www.phy6.org/earthmag/NSTA1C.htm

Site Map in Earth Sciences Class by David P. Stern Lab. for Extraterrestrial Physics, Goddard Space Flight Center (NASA) Greenbelt, MD 20771 earthmag ("at" symbol) phy6.org Talk presented at the Baltimore Meeting of the Natl. Science Teacher Assoc., 18 November 2000 This is Part 3 of three Go to Part 1 Go to Part 2 Dynamos in Nature How can you create electric currents? One way is a battery, which does so by chemical processes. However, the current which we use every day in our home is generated in other waysby electric generators, dynamos. All dynamos are based on principles found by Michael Faraday in a wire or electric conductor that moves through the region of magnetic forces magnetic field But the conductor can also be a conducting fluid We believe that the uneven rotation of the hot gases on the Sunfastest near the equator, as the motion of sunspots showshelps create electric currents in this manner. Not all details of the process are understood, because we can only guess what goes on under the surface of the Sun, in regions we cannot see, but the web site explains some of the ideas.

84. Magnetism The traditional concept of magnetism centers around the magnetic field and whatis know as a dipole. The term magnetic field simply describes a volume of http://www.ndt-ed.org/EducationResources/CommunityCollege/MagParticle/Physics/Ma

Home Education Resources NDT Course Material MPI Introduction to Magnetic Particle Inspection Introduction Introduction Basic Principles History of MPI Physics Magnetism Magnetic Mat'ls Magnetic Domains ... Suspension Liquids Testing Practices Dry Particles Wet Suspension Magnetic Rubber Process Control Particle Concentration Suspension Contamination Electrical System Lighting ... Eye Considerations Example Indications Visible Dry Powder Fluorescent Wet Magnetism Magnets are very common items in the workplace and household. Uses of magnets range from holding pictures on the refrigerator to causing torque in electric motors. Most people are familiar with the general properties of magnets but are less familiar with the source of magnetism. The traditional concept of magnetism centers around the magnetic field and what is know as a dipole. The term " magnetic field " simply describes a volume of space where there is a change in energy within that volume. This change in energy can be detected and measured. The location where a magnetic field can be detected exiting or entering a material is called a magnetic pole. Magnetic poles have never been detected in isolation but always occur in pairs and, thus, the name dipole. Therefore, a

85. Electricity And Magnetism The Earth s Magnetosphere, About general magnetism, field lines and the role ofthe magnetosphere. Schoolfor-Champions, Good information and practical http://iusd.k12.ca.us/uhs/cs2/electricity.htm

Electricity and Magnetism Home Fundamental Forces Charging Multimeter Diagram ... Electricity and Magnetism Notes Physics notes from the University of Winnipeg. The Earth's Magnetosphere About general magnetism, field lines and the role of the magnetosphere. School-for-Champions Good information and practical applications of static and magnetism Class Notes Unit 7 Electricity and Magnetism Note: all pages for reading are from your Sciences text. Electromagnetism Four fundamental Forces of Nature Weak nuclear forces Strong nuclear forces Electromagnetism Unified theory of magnetism and electricity Gravity Relative strength of each Magnetism Production of magnetism (subatomic interactions) Domains, ferromagnetism Dipole nature of magnetic poles Magnetic fields and flux lines Behavior of like and opposite poles Electromagnets and their uses Geographic and magnetic poles of the earth Magnetism Video (uses and nature of magnetism) Electrostatics [104 - 107] Source of electrical charges Interaction of charges Conservation of Charge Measurement of Charges (Coulomb’s, Force of a Charge compared to Gravity)

86. BBC - GCSE Bitesize - Physics | Electricity And Magnetism | Field Lines Round A Field lines go from North to South. Home / physics / electricity and magnetism /Electromagnetic forces. Physics, Biology, Chemistry, D T http://www.bbc.co.uk/schools/gcsebitesize/physics/electricity/electromagneticfor

@import url('/includes/tbenh.css') ; Home TV Radio Talk ... A-Z Index FRIDAY 23rd September 2005 Text only BBC Homepage Other Sites var jsversion = 1.0; var realInstalled = false; var wmpInstalled = false; var swpInstalled = false; var xmlHTTPEnabled = false; var xslEnabled = false; jsversion = 1.1; jsversion = 1.2; jsversion = 1.3; jsversion = 1.4; jsversion = 1.5; 'For IE detection... On Error Resume Next realInstalled = (IsObject(CreateObject("rmocx.RealPlayer G2 Control"))) wmpInstalled = (IsObject(CreateObject("MediaPlayer.MediaPlayer"))) swpInstalled = (IsObject(CreateObject("SWCtl.SWCtl"))) xmlHTTPEnabled = (IsObject(CreateObject("Msxml2.XMLHTTP"))) xslEnabled = (IsObject(CreateObject("Msxml2.DOMDocument"))) Site Guide Credits About the BBC Contact Us ... Help Like this page? Send it to a friend! Home physics electricity and magnetism / Electromagnetic forces Physics Biology Chemistry English Language English Literature French German Geography History ICT Maths Music PE Religious Studies Spanish Black Holes to Worm Holes: BBCi Space Post ideas and check out Science messages here.

87. Current Electricity And Magnetism CURRENT ELECTRICITY AND magnetism The force on a currentcarrying conductorin a magnetic field The force between parallel current-carrying conductors http://www.physchem.co.za/Current Electricity/Current.htm

© G R DELPIERRE and B T SEWELL 2002-2005 CURRENT ELECTRICITY AND MAGNETISM Contents for this page Related topics Current electricity Direct current Alternating current The magnetic field produced by a conductor ... Data Glossary Learning Outcomes After studying this section, you will (a) know how an electric current arises, and the difference between direct current and alternating current, (b) know about the existence of a magnetic field produced by a current flowing in a conductor, the Right Hand Rule, the force arising from this field and Fleming's Left Hand Motor Rule. Current electricity: The existence of an electric field in a conductor produces a current in the conductor. Current is a flow of charge, measured by the rate at which positive charge passes through any specified cross-sectional area. Current is a scalar quantity denoted by the symbol I . A conventional current flows from a positive terminal to a negative terminal, i.e. in the same direction as the field. In metals, the current comprises electrons which move in the field in the direction opposite to the conventional current. We will be concerned mainly with metallic conductors.

88. Exploring Magnetism Activity 1 explores magnetism and uses compasses to map magnetic field lines andtheir directions. Activity 2 uses iron filings to visualize the magnetic http://cse.ssl.berkeley.edu/SegwayEd/lessons/exploring_magnetism/exploring_magne

Jump To: introduction Table of Contents Introduction Session 1 : Magnetism Activity 1 : Mapping Magnetic Field Lines Activity 2 : Iron Filings and (2-3D) Magnetic Field Lines Worksheets and Assessment Rubric Session 2 : Electromagnetism Activity 1 : Exploring Magnetic Fields in Your Environment Activity 2 : Compass Needles Around a Simple Circuit Activity 3 : Mapping Magnetic Field Lines Activity 4 : Jumping Coils Activity 5 : Electric Current Generated with a Moving Magnet Worksheets and Assessment Rubrics Background Material Glossary Resources Acknowledgements Introduction back to top Included at the beginning of each session is a summary of the session, a list of national education standards that the session covers, and a list of materials required for the session. Each session is broken into several activities, with each activity outlined for the teacher. In the Background Material section, you can find science background for the lessons. A glossary can be found after the background section, and at the very end we recommend different resources finding materials to purchase and for learning more about magnetism. The activities in this guide are meant as primers for supplementary guides that allow students to learn about the importance of magnetic fields in space science, which are studied by NASA scientists. For example, in

89. ScienceMaster - JumpStart - Magnetism JumpStart magnetism on ScienceMaster.com. The region where this is observedis loosely called a magnetic field; a more specific look at the concept of http://www.sciencemaster.com/jump/physical/magnetic_fields.php

Today is JumpStart - Physical Science Magnetic Fields Magnetic Fields People not familiar with magnetism often view it as a somewhat mysterious property of specially treated iron or steel. Either pole can also attract iron objects such as pins and paper clips. That is because under the influence of a nearby magnet, each pin or paper clip becomes itself a temporary magnet, with its poles arranged in a way appropriate to magnetic attraction. But this property of iron is a very special type of magnetism, almost an accident of nature! It is all related to electricity. In 1821 Hans Christian Oersted in Denmark found, unexpectedly, that such an electric current caused a compass needle to move. An electric current produced a magnetic force! Andre-Marie Ampere in France soon unraveled the meaning. The fundamental nature of magnetism was not associated with magnetic poles or iron magnets, but with electric currents. The magnetic force was basically a force between electric currents (figure below): Here is how this can lead to the notion of magnetic poles. Bend the wires into circles with constant separation (figure below):

90. Geomagnetism Frequently Asked Questions To measure the Earth s magnetism in any place, we must measure the direction andintensity The Earth s magnetic field is described by seven parameters. http://www.ngdc.noaa.gov/seg/geomag/faqgeom.shtml

search NGDC NOAA NESDIS NGDC Geomagnetism ... privacy policy Illustration courtesy of Patricia Seed Geomagnetic Field Frequently Asked Questions 1. What is the Earth's magnetic field? 1a. What are the basics? 1b. Is the magnetic field different in different places of the Earth? 2. What are the magnetic elements? ... 9. Where can I find out more about geomagnetism? 1. What is the Earth's magnetic field? 1a. What are the basics? The Earth acts like a great spherical magnet, in that it is surrounded by a magnetic field. The Earth's magnetic field resembles, in general, the field generated by a dipole magnet (i.e., a straight magnet with a north and south pole) located at the center of the Earth. The axis of the dipole is offset from the axis of the Earth's rotation by approximately 11 degrees. This means that the north and south geographic poles and the north and south magnetic poles are not located in the same place. At any point, the Earth's magnetic field is characterized by a direction and intensity which can be measured. Often the parameters measured are the magnetic declination, D, the horizontal intensity, H, and the vertical intensity, Z. From these these elements, all other parameters of the magnetic field can be calculated. 1b. Is the magnetic field different in different places of the Earth?

91. Canada Science And Technology Museum As soon as the field is removed, however, the magnetism is lost. Like allforms of magnetism the Earth s magnetic field is produced by electric currents http://www.sciencetech.technomuses.ca/english/schoolzone/Info_Magnets.cfm

92. The Mathematical Theory Of Sculpture magnetism 3 Experiment of Shape using magnetic fluid by Minako Takeno The magnetic fluid can change shape within the magnetic field created by the two http://www.mi.sanu.ac.yu/vismath/takeno/

93. Magnetism -- Facts, Info, And Encyclopedia Article magnetized in a magnetic field and retain their magnetism when the field isremoved) Ferromagnetism (Magnetic field creates parallel but opposing spins; http://www.absoluteastronomy.com/encyclopedia/m/ma/magnetism.htm

Magnetism [Categories: Magnetism] In (The science of matter and energy and their interactions) physics magnetism is a phenomenon by which (The tangible substance that goes into the makeup of a physical object) materials exert an attractive or repulsive ((physics) the influence that produces a change in a physical quantity) force on other materials. Some well known materials that exhibit easily detectable magnetic properties are (A heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood) iron , some (An alloy of iron with small amounts of carbon; widely used in construction; mechanical properties can be varied over a wide range) steel s, and the (Solid homogeneous inorganic substances occurring in nature having a definite chemical composition) mineral (A permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically) lodestone ; however, all materials are influenced to one degree or another by the presence of a

94. Exploratorium: Science Snacks: Circles Of Magnetism I Circles of magnetism I. You can make a magnetic field that s stronger than theearth s! Compasses allow us to observe the direction of a magnetic field. http://www.exploratorium.edu/snacks/circles_magnetism_I.html

Circles of Magnetism I You can make a magnetic field that's stronger than the earth's! Compass needles are little magnets that are free to rotate. Compasses allow us to observe the direction of a magnetic field. Normally, they respond to the earth's magnetic field, orienting themselves parallel to magnetic field lines. If we create a magnetic field that is stronger than the field of the earth - for example, by using electric currents - a compass needle will orient itself parallel to the new field. A 6- or 12-volt lantern battery. A 1 foot (30 cm) length of heavy wire that is rigid enough to stand by itself. (You can use the wire from a coat hanger.) for building the stand (or another improvised stand). A flat, rigid support surface measuring approximately 6 x 6 inches (15 x 15 cm). (This can be made of posterboard or even a manila file folder.) It should have a hole in the center of it that is large enough for the wire to pass through. 4 or 6 small compasses

95. WonderQuest: Magical Magnetism, Electron “spin”, And Easy Iron Paths Magical magnetism, electron “spin”, and easy iron paths For answers to A bar magnet and its magnetic field. The field lines through air close the loop http://www.wonderquest.com/physics-magnetism.htm

Home Questions Index Ask-a-Question Newsletter ... Freelance Magical magnetism, electron “spin”, and easy iron paths Q: Why are some things magnetic? What makes them magnetic? (Jamar, Charlottesville, Virginia) Q: I have no clue how magnetism gets "frozen" in a magnet — there’s no current flowing, right? (Kevin, Penryn, California) A: A moving electrical charge (electric current) produces a magnetic field — macroscopic flow in wires, for example. Our polarized planet Earth is an example of really macro scopic flow. Earth has magnetic poles because of charged-particle currents roiling deep within its molten core. But, there’s more than macroscopic flow to magnetism, as your insightful question implies. How magnetism gets "frozen" in a magnet takes us to the microscopic level where some flow does occur — electrons orbiting the nucleus. However, the major contributor to a magnet’s magnetism is the inherent magnetic property of electrons that we call, somewhat misleadingly, "electron spin." The property "is an inherent quantum property with no classical analog," says

96. History A Ridiculously Brief History of Electricity and magnetism 1861 Maxwellpublishes a mechanical model of the electromagnetic field. http://maxwell.byu.edu/~spencerr/phys442/node4.html

Next: Review Sheet Up: No Title Previous: Homework Assignments History A Ridiculously Brief History of Electricity and Magnetism Mostly from E. T. Whittaker's A History of the Theories of Aether and Electricity... 900 BC - Magnus, a Greek shepherd, walks across a field of black stones which pull the iron nails out of his sandals and the iron tip from his shepherd's staff (authenticity not guaranteed). This region becomes known as Magnesia. 600 BC - Thales of Miletos rubs amber ( elektron in Greek) with cat fur and picks up bits of feathers. 1269 - Petrus Peregrinus of Picardy, Italy, discovers that natural spherical magnets (lodestones) align needles with lines of longitude pointing between two pole positions on the stone. 1600 - William Gilbert, court physician to Queen Elizabeth, discovers that the earth is a giant magnet just like one of the stones of Peregrinus, explaining how compasses work. He also discusses static electricity and invents an electric fluid which is liberated by rubbing. ca. 1620 - Niccolo Cabeo discovers that electricity can be repulsive as well as attractive.

97. Magnetism--Physical Science Lesson Plan (grades 9-12)--DiscoverySchool.com Discuss why studying bacteria and animals who use magnetic field lines for “Understanding magnetism” that relates to the earth’s magnetic field. http://school.discovery.com/lessonplans/programs/understanding-magnetism/

postionList = "compscreen,hedthick,admedia,tower,nuiad,interstitial"; OAS_RICH("interstitial"); OAS_RICH("admedia"); Grades K-5 Grades 6-8 Grades 9-12 Astronomy/Space ... Health History Ancient History U.S. History World History Life Science Animals Ecology Human Body The Microscopic World ... Weather 9-12 > Physical Science Grade level: 6-8 Subject: Physical Science Duration: Two class periods Objectives Materials Procedures Adaptations ... Credit Objectives Find a video description, video clip, and discussion questions. Understanding: Magnetism Use our free online Teaching Tools to create custom worksheets, puzzles and quizzes on this topic! Students will understand the following: Only certain materials can be attracted by a magnet. Those materials contain iron. Magnetism is caused by the behavior of atoms in a magnet. Materials In addition to research materials on magnetism and a computer with Internet access for the whole class, the following materials should be available for each group: Variety of objects including some that will and some that will not be attracted by a magnet (suggestions: aluminum foil, silver or gold jewelry, high-iron cereal crushed into a powder, crushed multivitamin tablet or emptied multivitamin capsule that contains iron, piece of videotape, piece of audiotape, inside of a computer disk Strong magnet Procedures Review with your students what they have learned about magnetism. Encourage them to discuss their experience with magnets, including experiments they have performed. Then let them know that they are about to perform a series of simple experiments that will show which of a group of objects will be attracted to a magnet.

98. PHYSICS & ASTRONOMY FORUMS (WITH A CONCENTRATION ON ELECTRICITY AND MAGNETISM) What is a magnetic field? How does this relate to what McGucken has been talking field is simply the REGION in which the effects of magnetism are felt. http://physicsastronomy.com/read.php?f=4&i=153&t=153

99. More Info On Magnetism magnetism......Field theory of electricity and magnetism, electric circuits and their symbols.Page 26 in. MicroUnit http://dev.nsta.org/ssc/moreinfo.asp?id=945

100. Magnetism --  Encyclopædia Britannica magnetism phenomenon associated with the motion of electric charges. resulting from the orientation of the Earth s magnetic field at the time of rock http://www.britannica.com/eb/article-9106020

Home Browse Newsletters Store ... Subscribe Already a member? Log in Content Related to this Topic This Article's Table of Contents Expand all Collapse all Introduction Fundamentals Magnetic field of steady currents Magnetic forces Lorentz force Repulsion or attraction between two magnetic dipoles Magnetization effects in matter Magnetic properties of matter ... Print this Table of Contents Shopping Price: USD $1495 Revised, updated, and still unrivaled. The Official Scrabble Players Dictionary (Hardcover) Price: USD $15.95 The Scrabble player's bible on sale! Save 30%. Merriam-Webster's Collegiate Dictionary Price: USD $19.95 Save big on America's best-selling dictionary. Discounted 38%! More Britannica products magnetism Page 1 of 16 phenomenon associated with the motion of electric charges . This motion can take many forms. It can be an electric current in a conductor or charged particles moving through space, or it can be the motion of an electron in atomic orbit. Magnetism is also associated with elementary particles, such as the electron, that have a property called spin. magnetism...

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