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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Magnetic Field Of A Current Loop01:16

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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.
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Magnetic Force Between Two Parallel Currents01:13

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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由单分子结合中的弹性环流产生的大量磁场

William Bro-Jørgensen1,2, Stephan P A Sauer1, Gemma C Solomon1,2,3

  • 1Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.

JACS Au
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概括

研究人员从单个分子的连接处计算出磁场. 他们发现特定的分子结构和条件,如高电流和小环直径,是产生实质性,实验相关磁场的关键.

关键词:
生物萨瓦特定律电流密度磁性分子电子环电流单分子电磁学单分子结

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科学领域:

  • 分子电子
  • 量子化学
  • 机器人

背景情况:

  • 用于单分子结合的电偏差导致电流通过道.
  • 有循环或螺旋结构的分子可以表现出循环电流,产生磁场.

研究的目的:

  • 计算单分子连接中弹道电流密度产生的磁场.
  • 确定有利于大量电流诱导磁场的分子结构和条件.

主要方法:

  • 实施生物萨瓦特法.
  • 从选定的循环和线性分子中的电流密度计算磁场.
  • 影响磁场强度的因素分析,包括电流,环的单向性和直径.

主要成果:

  • 实质性磁场的三个先决条件:高电流,偏差窗口内的单向环电流和小环直径.
  • 带有键长交替的循环无核可以产生mt范围的磁场.
  • 带有螺旋 π 系统的线性碳链也产生 mT 范围的场,可能达到接近共振的子特斯拉水平.

结论:

  • 在低偏差的分子线中产生实验相关的电流诱导磁场的概念证明.
  • 确定了特定的循环和线性分子作为产生显著磁场的有希望的候选物.