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Scalar multipole expansions and their dipole equivalents

 

作者: John P. Wikswo,   Kenneth R. Swinney,  

 

期刊: Journal of Applied Physics  (AIP Available online 1985)
卷期: Volume 57, issue 9  

页码: 4301-4308

 

ISSN:0021-8979

 

年代: 1985

 

DOI:10.1063/1.334589

 

出版商: AIP

 

数据来源: AIP

 

摘要:

If the source of a field that satisfies Poisson’s equation can be written as the divergence of a vectors, then a scalar multipole expansion of the source can be evaluated in terms ofs, which is a dipole density. A multipole expansion in terms of the dipole density can be computed about different origins. This allows us to evaluate the expansion of a dipole displaced from the origin and find a method of approximating some multipole expansions by displaced dipoles. In many physical applications it is known that the source is a displaced dipole, and we can find its location from a multipole expansion at some convenient location. It is possible to derive pictures in terms of dipole densities that in the proper limit become the individual multipoles. There are, however, ambiguities in that for some multipoles more than one picture gives the proper field.

 

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