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関連する概念動画

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...
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:
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Updated: Jun 6, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

巨大な原星からの磁気ジェット.

Carlos Carrasco-González1, Luis F Rodríguez, Guillem Anglada

  • 1Instituto Astrofísica Andalucía, Consejo Superior de Investigaciones Científicas (CSIC), Camino Bajo de Huétor 50, E-18008 Granada, Spain. charly@iaa.es

Science (New York, N.Y.)
|November 27, 2010
PubMed
まとめ
この要約は機械生成です。

研究者らは,若い恒星の物体ジェットで,活発な銀河核ジェットに似た,極化シンクロトロン放射を発見しました. これは,すべての天体物理ジェットの共通の起源を示唆し,ジェット形成と磁場に関する新しい洞察を提供します.

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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

Published on: May 9, 2020

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
09:48

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma

Published on: February 2, 2012

関連する実験動画

Last Updated: Jun 6, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

Cryogenic Liquid Jets for High Repetition Rate Discovery Science
08:34

Cryogenic Liquid Jets for High Repetition Rate Discovery Science

Published on: May 9, 2020

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
09:48

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma

Published on: February 2, 2012

科学分野:

  • 天体物理学 天体物理学
  • プラズマ物理学 プラズマ物理学

背景:

  • シンクロトロン放射は,活発な銀河核 (AGN) とマイクロクワザールからのジェットで知られている現象です.
  • 若い恒星物体 (YSOs) から噴射されるシンクロトロン放射の存在は,以前は確認されていなかった.

研究 の 目的:

  • YSOジェットにおける極化シンクロトロン放射の証拠を提示する.
  • YSOジェット内の磁場特性と構成を調査する.
  • YSOジェットの特性とAGNジェットの特徴を比較する.

主な方法:

  • ポラライゼーション測定を用いた観測天文学.
  • シンクロトロン放射特性の分析.
  • 磁場強度と方向の決定.磁場強度と方向の決定.

主要な成果:

  • YSOジェットで検出された偏極化されたシンクロトロン放射の証拠.
  • 表面磁場強度は約0.2ミリガウスで,ジェット軸に整列しています.
  • ジェット・エッジに向かって極化度が増加し,螺旋状の磁場と一致する.

結論:

  • この発見は,YSOジェットにおけるシンクロトロン放射の最初の証拠となる.
  • 観測された特徴はAGNジェットの特徴に似ており,天体物理ジェットの統一モデルを示唆しています.
  • これは,すべての天体物理ジェットの形成と進化の基礎となる共通の物理的メカニズムを暗示しています.