Difference between revisions of "Magnetic field"

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'''Magnetic fields''', resulting from the flow of [[electron]]s in [[metal]], impose an action-at-a-distance force on other [[charged particle]]s nearby.  This means that charged metals respond to magnetic fields by changing direction, or becoming attracted to or repelled from the field.
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A '''magnetic field''' is a [[vector]] field responsible for generating forces on electrically charged objects and magnets.  Magnetic fields are generated by magnetic [[dipole]]s, moving [[electric charge]]s, or changing [[electric field]]s.
  
==Scientific Facts==
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Magnetic fields are linked to electric fields; [[light]], for instance, is a propagating electric and magnetic [[wave]]. Relativistically, a magnetic force in one [[inertial frame]] corresponds to an electric force in another.
Magnetic fields, also known as '''B-fields''', are [[force field]]s that can be explained by [[relativistic]] effects of [[electric current]]s. Magnetic fields only exert a force on moving [[charge]]s. According to the "[[right hand rule]]," using your right hand to indicate the direction of current, the curl of the remaining fingers indicates the magnetic field, which is always perpendicular to the current, and running in the indicated.
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When trying to determine the magnetic forces and fields, the [[right hand rule]] often proves useful.
  
 
==Earth's Magnetic Field==
 
==Earth's Magnetic Field==

Revision as of 21:38, 23 September 2008

A magnetic field is a vector field responsible for generating forces on electrically charged objects and magnets. Magnetic fields are generated by magnetic dipoles, moving electric charges, or changing electric fields.

Magnetic fields are linked to electric fields; light, for instance, is a propagating electric and magnetic wave. Relativistically, a magnetic force in one inertial frame corresponds to an electric force in another.

When trying to determine the magnetic forces and fields, the right hand rule often proves useful.

Earth's Magnetic Field

The magnetic field of Earth is directional nearly north-to-south, although slightly askance, meaning that "magnetic north" is not the same as "true north," and a person who is orienteering must take into account this change of declination, although it is truly only marginally relevant, unless you are close to either pole.[1] This field has been decaying at a rapid rate of about about 5% per century, which casts doubt on the theory that the Earth is billions of years old.[2] This decay suggests that, at some point, the poles will invert.

The View of "Answers in Genesis"

Scientists have speculated about the history of Earth's magnetic field. One group that makes use of the Bible as a resource for science suggests that the history of the Earth's magnetic field is as depicted to the right.[3]

References

  1. Boy Scout Handbook.
  2. K.L. McDonald and R.H. Gunst, 'An analysis of the earth’s magnetic field from 1835 to 1965,’ ESSA Technical Report, IER 46-IES 1, U.S. Govt. Printing Office, Washington, 1967.
  3. http://www.answersingenesis.org/creation/v20/i2/magnetic.asp