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相关概念视频

Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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...
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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Multimachine Stability01:25

Multimachine Stability

Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...

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相关实验视频

Updated: May 24, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

从一个多层次的不稳定级联中重新连接磁场.

Auna L Moser1, Paul M Bellan

  • 1Applied Physics, California Institute of Technology, Pasadena, California 91125, USA. auna@caltech.edu

Nature
|February 17, 2012
PubMed
概括
此摘要是机器生成的。

磁性重新连接速度比经典模型预测的要快. 这项研究观察了从大规模的不稳定性到小规模 (离子皮肤深度) 的不稳定性,解释了快速重新连接的动态.

更多相关视频

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

相关实验视频

Last Updated: May 24, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

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

科学领域:

  • 等离子体物理学的物理.
  • 天体物理学 天体物理学
  • 空间物理 空间物理

背景情况:

  • 磁性重新连接对于空间和实验室中的等离子体动力学至关重要.
  • 观察到的重新连接率超过了经典电阻预测.
  • 建议微观过程 (离子拉莫尔半径,离子皮肤深度) 来解释快速的速度.

研究的目的:

  • 为了证明磁再连接中从宏观到微观尺度的过渡.
  • 解释磁动力学系统是如何进入微尺度物理学的.
  • 为了解决快速磁再连接的三维动态.

主要方法:

  • 实验室实验观察磁重新连接.
  • 不稳定级联的分析从宏观到微观的尺度.
  • 对三维等离子体动态的研究.

主要成果:

  • 观察到一连串的不稳定性,从磁动力学尺度到离子皮肤深度尺度.
  • 证明了宏观电流板薄化和微观不稳定性之间的联系.
  • 解决了重新连接过程的全部三维动态.

结论:

  • 观察到的不稳定级联解释了宏观系统如何访问微观物理以快速重新连接.
  • 这为自然和实验室等离子体的重新连接的冲动性提供了洞察力.
  • 这些发现弥合了磁动力学理论和微观等离子体行为之间的差距.