Wilks Coefficient - Revision history

2601:C:8300:21D:F81A:95AD:E692:6EEC: /* Example */

2014-10-19T05:49:20Z

Example

← Older revision		Revision as of 07:49, 19 October 2014
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32.97.110.59: /* Equation */

2014-02-11T21:53:42Z

Equation

← Older revision		Revision as of 23:53, 11 February 2014
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	~~{{Refimprove\|date=March 2013}}~~		Alyson is what my spouse enjoys to contact me but I psychic readings online ([http://findyourflirt.net/index.php?m=member_profile&p=profile&id=117823 findyourflirt.net]) don't like when individuals use my complete title. Since I was eighteen I've been working as a bookkeeper but quickly my wife and I will begin our [http://koreanyelp.com/index.php?document_srl=1798&mid=SchoolNews online psychic] personal business. What me and my family love is performing ballet but I've been taking on new issues recently. Alaska is exactly where he's usually been residing.<br><br>My web-site: accurate psychic readings ([http://jplusfn.gaplus.kr/xe/qna/78647 visit the following internet page])
	~~'''Magnetic pressure'''~~ is ~~an [[energy density]] associated with a [[magnetic field]]. Any magnetic field has an associated magnetic pressure contained by the boundary conditions on the field. It is identical~~ to ~~any other physical [[pressure]] except that it is carried by the magnetic field rather than~~ (~~in the case of a~~ [~~[gas]]) by the [[kinetic energy]] of gas molecules~~. ~~A gradient in field strength causes a force due to the magnetic [[pressure gradient]] called the '''magnetic pressure force'''~~.

	~~The magnetic pressure force is readily observed in an unsupported loop of [[wire]]~~. If an [[electric current]] passes through the loop, the wire serves as an [[electromagnet]], such that the magnetic field strength inside the loop is much greater than the field strength just outside the loop. This gradient in field strength gives rise to a magnetic pressure force that tends to stretch the wire uniformly outward. If enough current travels through the wire, the loop of wire will form a [[circle]]. At even higher currents, the magnetic pressure can create [[tensile stress]] that exceeds the [[tensile strength]] of the wire, causing it to fracture, or even explosively fragment. Thus, management of magnetic pressure is a significant challenge in the design of ultrastrong electromagnets.

	~~The force (in [[Centimeter gram second system of units\|cgs]~~]) ~~{{math\|~~''~~'F'''}} exerted on~~ a ~~coil by its own current is<ref>{{harvnb\|Garren\|1994\|p=3425}}</ref>~~

	~~:<math>~~
	~~\mathbf{F} =\dfrac{I^2}{c^2R}~~ [~~\ln(\dfrac{8R}{a}) - 1 + Y]~~
	</~~math>~~

	~~Where ''Y'' is the internal inductance of the coil, defined by the distribution of current~~. ~~''Y'' is 0 for high frequency currents carried mostly by the outer surface of the conductor, and 0~~.~~25 for DC currents distributed evenly throughout the conductor. See [[inductance]~~] ~~for more information~~.

	~~Interplay between magnetic pressure~~ and ~~ordinary gas pressure~~ is ~~important to [[magnetohydrodynamics]] and [[plasma physics]]~~. ~~Magnetic pressure can also be used to propel [[projectiles]]; this~~ is ~~the operating principle of a [[railgun]].~~

	~~If any currents present are parallel to a magnetic field, the field lines follow shapes in which the magnetic pressure gradient is balanced by the [[magnetic tension force]]~~. ~~Such a field configuration is called [[force-free magnetic field\|force-free]] because there is no [[Lorentz force]] (~~<~~math~~>~~j\times B=0~~<~~/math~~>~~). The familiar [[potential magnetic field]] is a special case of a force~~-~~free field~~: ~~potential field configurations occupy space that contains no electric current at all.~~

	~~The magnetic pressure <math>P_B</math> is given in [[International System of Units\|SI]] units (''P'' in [[Pascal (unit)\|Pa]], ''B'' in [[Tesla~~ (~~unit)\|T]], [[Permeability constant\|μ<sub>0</sub>]] in~~ [~~[Henry (unit)\|H]]/m) by~~

	:~~<math>P_B = \frac{B^2}{2\mu_0}</math>~~

	~~and in [[Centimeter gram second system of units\|cgs]] units (''P'' in [[Barye\|dyn~~/~~cm²]], ''B'' in [[Gauss (unit)\|G]]) by~~

	~~:<math>P_B = \frac{B^2}{8\pi}<~~/~~math>~~.

	~~==See also==~~
	* [[Magnetic tension force]]
	* [[Maxwell stress tensor]]

	~~== Notes ==~~
	~~{{Reflist\|3}}~~

	~~== References ==~~

	*{{cite journal
	~~\| author = Garren & Chen~~
	~~\| title = Lorentz Self Forces on Curved Current Loops~~
	~~\| year = 1994~~
	~~\| journal = [[Physics of Plasmas]]~~
	~~\| volume = 1~~
	~~\| issue = 10~~
	~~\| pages = 3425–3436~~
	~~\| doi = 10~~.~~1063~~/~~1.870491\|bibcode = 1994PhPl....1.3425G }}~~

	~~<references~~ />

	~~{{DEFAULTSORT:Magnetic Pressure}}~~
	~~[[Category:Plasma physics~~]]


	~~{{Physics-stub}}~~

en>Rabidpotatochip: "for both gender" to "for both genders".

2013-05-07T16:27:08Z

"for both gender" to "for both genders".

← Older revision		Revision as of 18:27, 7 May 2013
Line 1:		Line 1:
	The ~~individual who wrote~~ the ~~post is known~~ as ~~Jayson Hirano and he completely digs~~ that ~~title. To play lacross~~ is ~~something I truly appreciate doing~~. ~~Some time~~ in the ~~past he selected~~ to ~~reside~~ in ~~North Carolina and he doesn~~'~~t plan~~ on ~~changing it~~. ~~Invoicing~~ is ~~what I do~~.<br><br>~~Also visit my page .~~.. [~~http~~://~~kpupf~~.~~com~~/xe/~~talk/735373 certified psychics~~]		{{Refimprove\|date=March 2013}}
			'''Magnetic pressure''' is an [[energy density]] associated with a [[magnetic field]]. Any magnetic field has an associated magnetic pressure contained by the boundary conditions on the field. It is identical to any other physical [[pressure]] except that it is carried by the magnetic field rather than (in the case of a [[gas]]) by the [[kinetic energy]] of gas molecules. A gradient in field strength causes a force due to the magnetic [[pressure gradient]] called the '''magnetic pressure force'''.

			The magnetic pressure force is readily observed in an unsupported loop of [[wire]]. If an [[electric current]] passes through the loop, the wire serves as an [[electromagnet]], such that the magnetic field strength inside the loop is much greater than the field strength just outside the loop. This gradient in field strength gives rise to a magnetic pressure force that tends to stretch the wire uniformly outward. If enough current travels through the wire, the loop of wire will form a [[circle]]. At even higher currents, the magnetic pressure can create [[tensile stress]] that exceeds the [[tensile strength]] of the wire, causing it to fracture, or even explosively fragment. Thus, management of magnetic pressure is a significant challenge in the design of ultrastrong electromagnets.

			The force (in [[Centimeter gram second system of units\|cgs]]) {{math\|'''F'''}} exerted on a coil by its own current is<ref>{{harvnb\|Garren\|1994\|p=3425}}</ref>

			:<math>
			\mathbf{F} =\dfrac{I^2}{c^2R} [\ln(\dfrac{8R}{a}) - 1 + Y]
			</math>

			Where ''Y'' is the internal inductance of the coil, defined by the distribution of current. ''Y'' is 0 for high frequency currents carried mostly by the outer surface of the conductor, and 0.25 for DC currents distributed evenly throughout the conductor. See [[inductance]] for more information.

			Interplay between magnetic pressure and ordinary gas pressure is important to [[magnetohydrodynamics]] and [[plasma physics]]. Magnetic pressure can also be used to propel [[projectiles]]; this is the operating principle of a [[railgun]].

			If any currents present are parallel to a magnetic field, the field lines follow shapes in which the magnetic pressure gradient is balanced by the [[magnetic tension force]]. Such a field configuration is called [[force-free magnetic field\|force-free]] because there is no [[Lorentz force]] (<math>j\times B=0</math>). The familiar [[potential magnetic field]] is a special case of a force-free field: potential field configurations occupy space that contains no electric current at all.

			The magnetic pressure <math>P_B</math> is given in [[International System of Units\|SI]] units (''P'' in [[Pascal (unit)\|Pa]], ''B'' in [[Tesla (unit)\|T]], [[Permeability constant\|μ<sub>0</sub>]] in [[Henry (unit)\|H]]/m) by

			:<math>P_B = \frac{B^2}{2\mu_0}</math>

			and in [[Centimeter gram second system of units\|cgs]] units (''P'' in [[Barye\|dyn/cm²]], ''B'' in [[Gauss (unit)\|G]]) by

			:<math>P_B = \frac{B^2}{8\pi}</math>.

			==See also==
			* [[Magnetic tension force]]
			* [[Maxwell stress tensor]]

			== Notes ==
			{{Reflist\|3}}

			== References ==

			*{{cite journal
			\| author = Garren & Chen
			\| title = Lorentz Self Forces on Curved Current Loops
			\| year = 1994
			\| journal = [[Physics of Plasmas]]
			\| volume = 1
			\| issue = 10
			\| pages = 3425–3436
			\| doi = 10.1063/1.870491\|bibcode = 1994PhPl....1.3425G }}

			<references />

			{{DEFAULTSORT:Magnetic Pressure}}
			[[Category:Plasma physics]]


			{{Physics-stub}}

94.78.183.177: /* Example */

2011-11-06T11:10:31Z

Example

New page

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