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Magnetic Fields01:27

Magnetic Fields

7.7K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
7.7K
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

4.0K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
4.0K
Magnetic Field Lines01:19

Magnetic Field Lines

6.2K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
6.2K
Magnetic Damping01:17

Magnetic Damping

1.2K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.2K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

4.1K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
4.1K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.7K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
6.7K

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Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

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惑星ダイナモ波による磁気逆転

Andrey Sheyko1, Christopher C Finlay2, Andrew Jackson1

  • 1Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland.

Nature
|November 8, 2016
PubMed
まとめ
この要約は機械生成です。

地球の磁場逆転は 新しいダイナモ波のプロセスから生じるかもしれません この新しいモデルは低粘度と高磁気拡散で動作し,既存の理論に挑戦し,地磁気極性変化の洞察を提供します.

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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関連する実験動画

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Magnetically Induced Rotating Rayleigh-Taylor Instability
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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科学分野:

  • 地理学
  • マグネトヒドロダイナミック
  • 計算式流体力学

背景:

  • 地球の磁場は極性逆転を示しており,この現象は核の磁気水力学プロセスから生じている.
  • 現存するジオダイナモシミュレーションには,ローカルなロスビー数にリンクされた逆転メカニズムで,高粘度と柱状のコンベクションがしばしば含まれています.

研究 の 目的:

  • 低粘度,高磁気拡散体制で動作する逆転ジオダイナモモデルの代替クラスを探求する.
  • 従来のロスビー数パラダイムを超えた地磁気極性逆転の背後にあるメカニズムを調査する.

主な方法:

  • ジオダイナモモデルの数値シミュレーション
  • 低粘度と高磁気拡散率で動作するモデルの分析.
  • 内核の境界付近の東西流の切断の役割の検討.

主要な成果:

  • 粘度と柱状コンベクションが支配するモデルとは異なる,新しいタイプの逆転ジオダイナモモデルが特定されました.
  • ダイナモ波に似た強い東西流の切断による磁場伸縮は,逆転に不可欠であることが判明した.
  • このモデルは,地質学的に重要な境界条件で,低粘度,高磁気拡散状態で動作します.

結論:

  • 特定されたダイナモ波のメカニズムは,地磁気極性逆転に関する新しい視点を提供します.
  • このメカニズムは,低粘度および高磁気拡散条件において重要であり,観測された地磁気逆転に寄与する可能性があります.