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相关概念视频

Magnetic Fields01:27

Magnetic Fields

6.0K
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...
6.0K
Magnetic Field Lines01:19

Magnetic Field Lines

5.4K
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:
5.4K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.1K
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.
6.1K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.6K
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...
5.6K
Magnetic Flux01:18

Magnetic Flux

4.2K
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...
4.2K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

5.2K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
5.2K

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相关实验视频

Updated: May 3, 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

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测量了巨大的磁场.

M Tatarakis1, I Watts, F N Beg

  • 1The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, UK. m.tatarakis@ic.ac.uk

Nature
|January 18, 2002
PubMed
概括
此摘要是机器生成的。

研究人员在实验室环境中测量了最强的磁场,超过340兆瓦. 这些强烈的场是在临界密度表面附近的激光-等离子体相互作用中产生的.

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相关实验视频

Last Updated: May 3, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Published on: June 9, 2016

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科学领域:

  • 血物理学的等离子体物理学
  • 高能量密度物理学 高能量密度物理学
  • 天体物理等离子体模拟.

背景情况:

  • 理论模型预测激光产生的等离子体中的强磁场.
  • 这些场预计在临界密度表面附近,对于激光能量吸收至关重要.
  • 这些领域的直接实验测量一直是一个重大挑战.

研究的目的:

  • 在激光-等离子体相互作用中实验验证预测磁场的存在和大小.
  • 为了达到在实验室环境中记录的最高磁场强度.
  • 为了研究激烈的激光物质相互作用期间磁场生成的动态.

主要方法:

  • 使用高强度激光脉冲来创建密集的等离子体.
  • 使用极度测量测量来检测和量化磁场.
  • 分析自我生成的激光波作为诊断工具.

主要成果:

  • 成功记录了超过340兆瓦的磁场.
  • 实现了迄今为止最高的实验室磁场测量.
  • 证明了使用激光波诊断来测量这些极端场的可行性.

结论:

  • 实验证据证实了激光制造的等离子体中存在巨大的磁场.
  • 这项研究为实验室磁场生成提供了新的基准.
  • 这些发现对理解天体物理现象和惯性限制融合有意义.