Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Magnetic Fields01:27

Magnetic Fields

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Lines01:19

Magnetic Field Lines

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:
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Stress pinch points from glacial loading modulate magma ascent and storage in continental arcs.

Nature communications·2026
Same author

Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms.

Science advances·2024
Same author

Intercalibration of <sup>40</sup>Ar/<sup>39</sup>Ar laboratories in China, the USA and Russia for Emeishan volcanism and the Guadalupian-Lopingian boundary.

National science review·2021
Same author

Transient rhyolite melt extraction to produce a shallow granitic pluton.

Science advances·2021
Same author

Synchronizing volcanic, sedimentary, and ice core records of Earth's last magnetic polarity reversal.

Science advances·2019
Same author

Geomorphic expression of rapid Holocene silicic magma reservoir growth beneath Laguna del Maule, Chile.

Science advances·2018
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
関連記事をすべて見る

関連する実験動画

Updated: Jun 30, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

地球の外核における磁気源分離.

Kenneth A Hoffman1, Brad S Singer

  • 1Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA. khoffman@calpoly.edu

Science (New York, N.Y.)
|September 27, 2008
PubMed
まとめ
この要約は機械生成です。

地球の軸性二極場は,非軸性二極場 (NAD) から分離して発生する. この地磁界の分離は,地球の核内の明確なダイナモプロセスを示唆しています.

さらに関連する動画

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

関連する実験動画

Last Updated: Jun 30, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

科学分野:

  • 地質物理学 地質物理学とは地質物理学です.
  • 地球科学 地球科学 地球科学
  • 地磁気学とは地磁気学です.

背景:

  • 地球の磁場は,主に液体外核のジオダイナモによって生成されます.
  • 地磁場は,軸対極コンポーネントと,より複雑な非軸対極コンポーネント (NAD) を含む.
  • これらのコンポーネントの異なる源を理解することは,古磁気データとコアダイナミクスの解釈に不可欠です.

研究 の 目的:

  • 非軸二極 (NAD) フィールドソースからの地球の軸二極フィールドソースの独立性を調査する.
  • ジオダイナモとコア-マントルの相互作用を理解するために,この独立性の意味を探求する.
  • 地磁場行動を分析するための新しい枠組みを提供すること.

主な方法:

  • 歴史的な地磁場構造と古磁場行動の相関分析.
  • 精確に日付を付けられた溶岩の流れを調査し,弱いまたは存在しない軸性二極場の期間を捉える.
  • 地球の流体の中核内の磁気源の分層化を推論するための地球物理モデリング.

主要な成果:

  • 証拠によると,軸二極場はNAD場を生成する源から大きく独立している.
  • 軸二極フィールドは,NADフィールドと比較して,最下層マントルの影響が著しく少ないように見える.
  • 流体コア内の磁気源の分層化が提案されており,軸二極は明確な層である.

結論:

  • 地球の軸性二極場と非軸性二極場 (NAD) は,原子核内の大きく異なるプロセスから発生しています.
  • 最下層マントルの影響に対する軸二極場の相対的な免疫は,層化されたコアダイナモモデルをサポートしています.
  • 将来の地磁場モデルは,時空ダイナモプロセスのこの二分法を考慮する必要があります.