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関連する概念動画

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.
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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 due to Moving Charges01:25

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...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Updated: Jul 9, 2026

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

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冠状回路における滑り磁気再接続

Guillaume Aulanier1, Leon Golub, Edward E Deluca

  • 1Observatoire de Paris, Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie (UPMC), Université Paris Diderot, 92190 Meudon, France. guillaume.aulanier@obspm.fr

Science (New York, N.Y.)
|December 8, 2007
PubMed
まとめ

太陽フレアは磁気再接続によって引き起こされます. 新しい証拠は,磁場線が互いに滑り合う滑りやすい磁気再接続プロセスが,太陽フレアと冠状熱の理解の鍵であることを示唆しています.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Published on: April 4, 2013

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

科学分野:

  • プラズマ物理学のプラズマ物理学
  • 太陽物理 太陽物理学
  • 天体物理学 天体物理学

背景:

  • 太陽の冠状回路における磁気再接続は,太陽フレアと冠状熱を誘発する.
  • 標準モデルは,断続的な磁場マッピングにおいて,瞬時の磁場線断裂を想定している.
  • 別の滑り磁気再接続モードは,連続するが急なフィールドグラデーションで発生する可能性があります.

研究 の 目的:

  • 太陽のコロナにおける磁気再接続の滑落の存在と影響を調査する.
  • 滑り磁気再接続モデルに観測的サポートを提供するために.
  • 太陽光および実験用プラズマにおける磁気再接続の解釈を参考にするために.

主な方法:

  • ヒノード宇宙船からの柔らかいX線観測の分析.
  • 冠状回路の急速な双方向運動の観測.
  • 観測された現象と磁気再接続の理論的モデルを比較する.

主要な成果:

  • 冠状回路の観測された高速双方向運動は,滑りやすい磁気再接続の証拠を提供します.
  • このレジムは,磁場マッピングが連続しているが,急な傾斜がある場合に動作します.
  • 標準的な即時再接続モデルに代わるものをサポートします.

結論:

  • 滑りやすい磁気再接続は,太陽のコロナで実行可能なプロセスです.
  • このメカニズムは,太陽フレアや冠状熱を研究する際に考慮されるべきです.
  • この発見は,太陽光と実験室でのプラズマ再接続研究の両方にとって重要である.