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06_lecture_ppt

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... Different colors of light have different wavelengths (and hence frequencies). But all of them are quite small. Red light has wavelength 700nm while blue light has a shorter wavelength of 475nm. There are electromagnetic waves of all possible wavelengths. Some of them were known before, but were thou ...
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Determination of the Earth`s Magnetic Field

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Electromagnets Worksheet Answers

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Monday, Oct. 24, 2005 - UTA HEP WWW Home Page

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... Point out how the compass needle points to the end of the wire coil, rather than toward the coil itself as it would if a straight wire were used instead of a coil of wire. In other words, the coil of wire has a magnetic field like a bar magnet, unlike the circular magnetic field of a straight wire. ...
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... produced by time varying fields, it is found that, in vacuum, the velocity of these waves c is exactly the speed of light in vacuum. In this derivation, it is shown that c can be expressed in terms of two fundamental constants that are used in earlier chapters: The permittivity of free space ε0 & th ...
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Phys 202 Fall 2000

< 1 ... 66 67 68 69 70 71 72 73 74 ... 161 >

Force between magnets



Magnets exert forces and torques on each other due to the complex rules of electromagnetism. The forces of attraction field of magnets are due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of fundamental particles (such as electrons) that make up the material. Both of these are modeled quite well as tiny loops of current called magnetic dipoles that produce their own magnetic field and are affected by external magnetic fields. The most elementary force between magnets, therefore, is the magnetic dipole–dipole interaction. If all of the magnetic dipoles that make up two magnets are known then the net force on both magnets can be determined by summing up all these interactions between the dipoles of the first magnet and that of the second.It is always more convenient to model the force between two magnets as being due to forces between magnetic poles having magnetic charges 'smeared' over them. Such a model fails to account for many important properties of magnetism such as the relationship between angular momentum and magnetic dipoles. Further, magnetic charge does not exist. This model works quite well, though, in predicting the forces between simple magnets where good models of how the 'magnetic charge' is distributed is available.
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