### Abstract

The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction.

Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole.

The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived

Original language | English |
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Pages (from-to) | 954-959 |

Journal | IEEE Transactions on Magnetics |

Volume | 31 |

Issue number | 2 |

DOIs | |

Publication status | Published - 1995 |

MoE publication type | A1 Journal article-refereed |

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### Cite this

*IEEE Transactions on Magnetics*,

*31*(2), 954-959. https://doi.org/10.1109/20.364768

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*IEEE Transactions on Magnetics*, vol. 31, no. 2, pp. 954-959. https://doi.org/10.1109/20.364768

**Low-frequency image theory for a current dipole in front of a permeable sphere.** / Sten, Johan.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Low-frequency image theory for a current dipole in front of a permeable sphere

AU - Sten, Johan

PY - 1995

Y1 - 1995

N2 - Image theory, previously developed for an electric low-frequency dipole in front of a dielectric sphere, is formulated for the magnetically permeable sphere. The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction. Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole. The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived

AB - Image theory, previously developed for an electric low-frequency dipole in front of a dielectric sphere, is formulated for the magnetically permeable sphere. The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction. Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole. The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived

U2 - 10.1109/20.364768

DO - 10.1109/20.364768

M3 - Article

VL - 31

SP - 954

EP - 959

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 2

ER -