Magnetic field - Revision history

Jmdonev: 1 revision imported

2018-05-11T18:17:11Z

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Jmdonev at 18:33, 10 May 2018

2018-05-10T18:33:44Z

← Older revision		Revision as of 18:33, 10 May 2018
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	[[Category:Done ~~2015~~-09-06]]		[[Category:Done 2018-04-30]]
	[[File:Magnet0873.png\|thumb\|300px\|Figure 1: Magnetic field lines from a bar magnet visualized using iron filings.<ref>Wikimedia commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/5/57/Magnet0873.png</ref>]]		[[File:Magnet0873.png\|thumb\|300px\|Figure 1: Magnetic field lines from a bar magnet visualized using iron filings.<ref>Wikimedia commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/5/57/Magnet0873.png</ref>]]

	<onlyinclude>'''Magnetic fields''' are produced by changing electric ~~fields~~, usually ''moving'' [[charge]]s such as [[electron]]s, often the form of a macroscopic [[current]] (like the current in a [[wire]]) or a microscopic current (such as in an [[atom]]ic orbit).<ref name=hyper>Hyperphysics, ''Magnetic Field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html</ref> In one of the most beautiful examples of symmetry in physics, changing magnetic fields create electric fields.</onlyinclude> These electric fields that come from changing magnetic fields are how electric ~~generators~~ can create electric current.		<onlyinclude>'''Magnetic fields''' are produced by changing [[electric field]]s, usually through ''moving'' [[charge]]s such as [[electron]]s, often in the form of a macroscopic [[electric current]] (like the current in a [[wire]]) or a microscopic current (such as in an [[atom]]ic orbit).<ref name=hyper>Hyperphysics, ''Magnetic Field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html</ref> In one of the most beautiful examples of symmetry in physics, changing magnetic fields create electric fields.</onlyinclude> These electric fields that come from changing magnetic fields are how electric [[generator]]s can create electric current.

	A magnetic field is a vector field, meaning it has a specified magnitude and direction at any point. The SI unit of magnetic field is the Tesla (T) in honor of physicist [[Tesla\|Nikola Tesla]], with [[units]] of [[newton\|N]]/[[ampere\|A]]·[[meter\|m]]. The Tesla is a huge unit, with a 1 T magnetic field being quite large. A smaller ~~unit the~~ Gauss (after the great physicist/mathematician Carl Friedrich Emmanuel Gauss) it one ten thousandth of a Tesla. The magnetic field of the Earth is roughly 1 Gauss but it varies depending on where the measurement is taken.		A magnetic field is a vector field, meaning it has a specified magnitude and direction at any point. The SI unit of magnetic field is the Tesla (T) in honor of physicist [[Tesla\|Nikola Tesla]], with [[units]] of [[newton\|N]]/[[ampere\|A]]·[[meter\|m]]. The Tesla is a huge unit, with a 1 T magnetic field being quite large. A smaller unit—the Gauss (named after the great physicist/mathematician Carl Friedrich Emmanuel Gauss) is one ten thousandth of a Tesla. The magnetic field of the [[Earth]] is roughly 1 Gauss, (but it varies depending on where the measurement is taken), so 1 T is a magnetic field ten thousand times stronger than Earth's!

	[[Magnet]]s are materials that have a magnetization caused by microscopic properties of atoms, and the magnetic field they ~~give off~~ is characterized by their north and south poles. The direction of these magnetic fields always points from the north pole to the south pole. This convention can be used to determine the [[force]] the magnet will apply on a charge, and how one magnet will interact with other magnets.		[[Magnet]]s are materials that have a magnetization caused by microscopic properties of atoms and the magnetic field they produce is characterized by their north and south poles. The direction of these magnetic fields always points from the north pole to the south pole. This convention can be used to determine the [[force]] the magnet will apply on a charge, and how one magnet will interact with other magnets.

	Magnetic fields are different from [[electric field]]s and [[gravitational field]]s, in that the force they apply on an object is not parallel to the field. A magnetic field actually acts ''perpendicular'' to a moving charge in its presence. To learn more about how this force is applied to a moving charge, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html hyperphysics].		Magnetic fields are different from [[electric field]]s and [[gravitational field]]s, in that the force they apply on an object is not parallel to the field. A magnetic field actually acts ''perpendicular'' to a moving charge in its presence. To learn more about how this force is applied to a moving charge, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html hyperphysics].
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	===Pole Naming Convention of the Earth===		===Pole Naming Convention of the Earth===
	Although it is logical to assume that the North and South Pole on the Earth represent the North and South poles of a very large bar magnet, this is not the case. The north pole is the direction that the north end of a compass points. What people on Earth generally refer to as the North Pole in the geographic sense is actually the magnetic south pole, and vice versa. This means that if a compass needle is pointing towards the geographic North Pole of the Earth, the compass needle is aligned with the south magnetic pole.<ref>Hyperphysics, ''Magnets and Electromagnets'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html</ref><ref>R. Serway and C. Vuille, "Magnets" in ''Essentials of College Physics'' [Online], Available: http://books.google.ca/books?id=8n4NCyRgUMEC&pg=PA493&redir_esc=y#v=onepage&q&f=false</ref>		Although it is logical to assume that the North and South Pole on the Earth represent the North and South poles of a very large bar magnet, this is not the case. The north pole is the direction that the north end of a compass points. What people on Earth generally refer to as the North Pole in the geographic sense is actually the magnetic south pole, and vice versa. This means that if a compass needle is pointing towards the geographic North Pole of the Earth, the compass needle is aligned with the south magnetic pole.<ref>Hyperphysics, ''Magnets and Electromagnets'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html</ref><ref>R. Serway and C. Vuille, "Magnets" in ''Essentials of College Physics'' [Online], Available: http://books.google.ca/books?id=8n4NCyRgUMEC&pg=PA493&redir_esc=y#v=onepage&q&f=false</ref>

			== For Further Reading ==
			For further information please see the related pages below:
			*[[Magnet]]
			*[[Magnetic flux]]
			*[[Electric field]]
			*[[Electric generator]]
			* Or explore a [[Special:Random\| random page!]]

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]
	~~[[category: Mark edit]]~~

J.williams: 1 revision imported

2015-09-18T16:52:09Z

1 revision imported

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Jmdonev at 20:08, 17 September 2015

2015-09-17T20:08:28Z

← Older revision		Revision as of 20:08, 17 September 2015
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	[[Category:Done 2015-04-01]]		[[Category:Done 2015-09-06]]
	[[File:Magnet0873.png\|thumb\|300px\|Figure 1: Magnetic field lines from a bar magnet visualized using iron filings.<ref>Wikimedia commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/5/57/Magnet0873.png</ref>]]		[[File:Magnet0873.png\|thumb\|300px\|Figure 1: Magnetic field lines from a bar magnet visualized using iron filings.<ref>Wikimedia commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/5/57/Magnet0873.png</ref>]]

	<onlyinclude>'''Magnetic fields''' are produced by changing electric fields, usually ''moving'' [[charge]]s such as [[electron]]s, often the form of a macroscopic [[current]] (like the current in a [[wire]]) or a microscopic current (such as in an [[atom]]ic orbit).<ref name=hyper>Hyperphysics, ''Magnetic Field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html</ref> In one of the most beautiful examples of symmetry in physics, changing magnetic fields create electric fields.</onlyinclude> These electric fields that come from changing magnetic fields are how electric generators can create electric current.		<onlyinclude>'''Magnetic fields''' are produced by changing electric fields, usually ''moving'' [[charge]]s such as [[electron]]s, often the form of a macroscopic [[current]] (like the current in a [[wire]]) or a microscopic current (such as in an [[atom]]ic orbit).<ref name=hyper>Hyperphysics, ''Magnetic Field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html</ref> In one of the most beautiful examples of symmetry in physics, changing magnetic fields create electric fields.</onlyinclude> These electric fields that come from changing magnetic fields are how electric generators can create electric current.

	A magnetic field is a vector field, meaning it has a specified magnitude and direction at any point. The SI unit of magnetic field is the Tesla (T) in honor of physicist [[Tesla\|Nikola Tesla]], with units of [[newton\|N]]/[[ampere\|A]]·[[meter\|m]]. The Tesla is a huge unit, with a 1 T magnetic field being quite large. A smaller unit the Gauss (after the great physicist/mathematician Carl Friedrich Emmanuel Gauss) it one ten thousandth of a Tesla. The magnetic field of the Earth is roughly 1 Gauss but it varies depending on where the measurement is taken.		A magnetic field is a vector field, meaning it has a specified magnitude and direction at any point. The SI unit of magnetic field is the Tesla (T) in honor of physicist [[Tesla\|Nikola Tesla]], with [[units]] of [[newton\|N]]/[[ampere\|A]]·[[meter\|m]]. The Tesla is a huge unit, with a 1 T magnetic field being quite large. A smaller unit the Gauss (after the great physicist/mathematician Carl Friedrich Emmanuel Gauss) it one ten thousandth of a Tesla. The magnetic field of the Earth is roughly 1 Gauss but it varies depending on where the measurement is taken.

	[[Magnet]]s are materials that have a magnetization caused by microscopic properties of atoms, and the magnetic field they give off is characterized by their north and south poles. The direction of these magnetic fields always points from the north pole to the south pole. This convention can be used to determine the force the magnet will apply on a charge, and how one magnet will interact with other magnets.		[[Magnet]]s are materials that have a magnetization caused by microscopic properties of atoms, and the magnetic field they give off is characterized by their north and south poles. The direction of these magnetic fields always points from the north pole to the south pole. This convention can be used to determine the [[force]] the magnet will apply on a charge, and how one magnet will interact with other magnets.

	Magnetic fields are different from [[electric field]]s and [[gravitational field]]s, in that the force they apply on an object is not parallel to the field. A magnetic field actually acts ''perpendicular'' to a moving charge in its presence. To learn more about how this force is applied to a moving charge, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html hyperphysics].		Magnetic fields are different from [[electric field]]s and [[gravitational field]]s, in that the force they apply on an object is not parallel to the field. A magnetic field actually acts ''perpendicular'' to a moving charge in its presence. To learn more about how this force is applied to a moving charge, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html hyperphysics].
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	==Magnetic Field of the Earth==		==Magnetic Field of the Earth==
	The [[Cross section of the Earth\|Earth]] has its own magnetic field, which was originally thought to be from its iron composition in the core, but is now surmised to be created by circulating electric currents in the liquid core.<ref>Hyperphysics, ''Magnetic Field of the Earth'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html</ref> The magnetic field of the Earth protects life from harmful solar winds from the [[Sun]], whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation (shown in Figure 4).<ref>nature, ''Solar wind hammers the ozone layer'' [Online], Available: http://www.nature.com/news/2005/050228/full/news050228-12.html</ref> The interaction of the Earth's magnetic field and solar wind produces the well-known phenomena of the Auroras, shown in Figure 5.		The [[Cross section of the Earth\|Earth]] has its own magnetic field, which was originally thought to be from its iron composition in the core, but is now surmised to be created by circulating electric currents in the [[liquid]] core.<ref>Hyperphysics, ''Magnetic Field of the Earth'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html</ref> The magnetic field of the Earth protects life from harmful solar winds from the [[Sun]], whose charged particles would otherwise strip away the [[ozone layer]] that protects the Earth from harmful [[ultraviolet radiation]] (shown in Figure 4).<ref>nature, ''Solar wind hammers the ozone layer'' [Online], Available: http://www.nature.com/news/2005/050228/full/news050228-12.html</ref> The interaction of the Earth's magnetic field and solar wind produces the well-known phenomena of the Auroras, shown in Figure 5.

	<gallery mode=packed caption="Earth's magnetic field vs Solar winds" widths="450px" heights="200px" >		<gallery mode=packed caption="Earth's magnetic field vs Solar winds" widths="450px" heights="200px" >
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	===Pole Naming Convention of the Earth===		===Pole Naming Convention of the Earth===
	Although it is logical to assume that the North and South Pole on the Earth represent the North and South poles of a very large bar magnet, this is not the case. The north pole is the direction that the north end of a compass points. What people on Earth generally refer to as the North Pole in the geographic sense is actually the magnetic south pole, and vice versa. This means that if a compass needle is pointing towards the geographic North Pole of the Earth, the compass needle is aligned with the south magnetic pole.		Although it is logical to assume that the North and South Pole on the Earth represent the North and South poles of a very large bar magnet, this is not the case. The north pole is the direction that the north end of a compass points. What people on Earth generally refer to as the North Pole in the geographic sense is actually the magnetic south pole, and vice versa. This means that if a compass needle is pointing towards the geographic North Pole of the Earth, the compass needle is aligned with the south magnetic pole.<ref>Hyperphysics, ''Magnets and Electromagnets'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html</ref><ref>R. Serway and C. Vuille, "Magnets" in ''Essentials of College Physics'' [Online], Available: http://books.google.ca/books?id=8n4NCyRgUMEC&pg=PA493&redir_esc=y#v=onepage&q&f=false</ref>

	<ref>Hyperphysics, ''Magnets and Electromagnets'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html</ref><ref>R. Serway and C. Vuille, "Magnets" in ''Essentials of College Physics'' [Online], Available: http://books.google.ca/books?id=8n4NCyRgUMEC&pg=PA493&redir_esc=y#v=onepage&q&f=false</ref>

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]
			[[category: Mark edit]]

J.williams: 1 revision imported

2015-08-26T21:31:19Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
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J.williams at 16:56, 12 August 2015

2015-08-12T16:56:47Z

New page

[[Category:Done 2015-04-01]]
[[File:Magnet0873.png|thumb|300px|Figure 1: Magnetic field lines from a bar magnet visualized using iron filings.<ref>Wikimedia commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/5/57/Magnet0873.png</ref>]]

<onlyinclude>'''Magnetic fields''' are produced by changing electric fields, usually ''moving'' [[charge]]s such as [[electron]]s, often the form of a macroscopic [[current]] (like the current in a [[wire]]) or a microscopic current (such as in an [[atom]]ic orbit).<ref name=hyper>Hyperphysics, ''Magnetic Field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html</ref> In one of the most beautiful examples of symmetry in physics, changing magnetic fields create electric fields.</onlyinclude> These electric fields that come from changing magnetic fields are how electric generators can create electric current.

A magnetic field is a vector field, meaning it has a specified magnitude and direction at any point. The SI unit of magnetic field is the Tesla (T) in honor of physicist [[Tesla|Nikola Tesla]], with units of [[newton|N]]/[[ampere|A]]·[[meter|m]]. The Tesla is a huge unit, with a 1 T magnetic field being quite large. A smaller unit the Gauss (after the great physicist/mathematician Carl Friedrich Emmanuel Gauss) it one ten thousandth of a Tesla. The magnetic field of the Earth is roughly 1 Gauss but it varies depending on where the measurement is taken.

[[Magnet]]s are materials that have a magnetization caused by microscopic properties of atoms, and the magnetic field they give off is characterized by their north and south poles. The direction of these magnetic fields always points from the north pole to the south pole. This convention can be used to determine the force the magnet will apply on a charge, and how one magnet will interact with other magnets.

Magnetic fields are different from [[electric field]]s and [[gravitational field]]s, in that the force they apply on an object is not parallel to the field. A magnetic field actually acts ''perpendicular'' to a moving charge in its presence. To learn more about how this force is applied to a moving charge, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html hyperphysics].

<gallery mode=packed caption="Magnetic field lines" widths="400px" heights="200px" >
File:Magnetic field of bar magnets attracting.png|Figure 2: The magnetic field lines from a North-South interaction of magnetic fields.<ref>Wikimedia Commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/f/fb/Magnetic_field_of_bar_magnets_attracting.png</ref>
File:Magnetic field of bar magnets repelling.png|Figure 3: The magnetic field lines from a repelling magnetic interaction (North-North or South-South)<ref>http://upload.wikimedia.org/wikipedia/commons/1/14/Magnetic_field_of_bar_magnets_repelling.png</ref>
</gallery>

==Magnetic Field of the Earth==
The [[Cross section of the Earth|Earth]] has its own magnetic field, which was originally thought to be from its iron composition in the core, but is now surmised to be created by circulating electric currents in the liquid core.<ref>Hyperphysics, ''Magnetic Field of the Earth'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html</ref> The magnetic field of the Earth protects life from harmful solar winds from the [[Sun]], whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation (shown in Figure 4).<ref>nature, ''Solar wind hammers the ozone layer'' [Online], Available: http://www.nature.com/news/2005/050228/full/news050228-12.html</ref> The interaction of the Earth's magnetic field and solar wind produces the well-known phenomena of the Auroras, shown in Figure 5.

<gallery mode=packed caption="Earth's magnetic field vs Solar winds" widths="450px" heights="200px" >
File:Solarwind.jpg|Figure 4: The magnetic field of the Earth protects the planet from harsh solar winds.<ref>NASA Sun Earth on Flickr [Online], Available: https://www.flickr.com/photos/gsfc/4445502419/</ref> Note the Earth-sun distance is not to scale in this image, the Earth is much farther away from the sun than this picture implies.
File:Aurora.jpg|Figure 5: Aurora Borealis, a product of the interaction of the Earth's magnetic field and solar wind.<ref>Wikimedia Commons [Online], Available: http://commons.wikimedia.org/wiki/File:The_Aurora_Borealis_or_Northern_Lights_shine_above_Bear_Lake_in_Alaska_050910-F-MS415-009.jpg</ref>
</gallery>

===Pole Naming Convention of the Earth===
Although it is logical to assume that the North and South Pole on the Earth represent the North and South poles of a very large bar magnet, this is not the case. The north pole is the direction that the north end of a compass points. What people on Earth generally refer to as the North Pole in the geographic sense is actually the magnetic south pole, and vice versa. This means that if a compass needle is pointing towards the geographic North Pole of the Earth, the compass needle is aligned with the south magnetic pole.

<ref>Hyperphysics, ''Magnets and Electromagnets'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html</ref><ref>R. Serway and C. Vuille, "Magnets" in ''Essentials of College Physics'' [Online], Available: http://books.google.ca/books?id=8n4NCyRgUMEC&pg=PA493&redir_esc=y#v=onepage&q&f=false</ref>

==References==
{{reflist}}
[[Category:Uploaded]]