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相关概念视频

Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
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Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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...
764
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

2.5K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
2.5K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

5.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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相关实验视频

Updated: Jan 14, 2026

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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外源电场的皮层调制与电极二极体相一致.

Joana Covelo1, Jaume Colom2, Julia Weinert1

  • 1Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), C/Rosselló 149-153, 08036 Barcelona, Spain.

Neuroscience
|October 16, 2025
PubMed
概括

电场 (EF) 影响大脑活动. 这项研究表明,外部EFs的方向显著影响皮质调制,垂直于表面的场是最有效的,支持内源场的作用.

关键词:
大脑皮层的大脑皮层.计算模型 计算模型皮层的柱子 皮层的柱子电动二极体是电动二极体.神经调节是一种神经调节.tDCSCS 是一个很好的方法.

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科学领域:

  • 神经科学是一个神经科学.
  • 计算神经科学是一种神经科学.
  • 生物物理学的生物物理.

背景情况:

  • 内源和外源电场 (EFs) 调节皮质活动.
  • 现有的数据表明,内源EF效应与电极对齐,影响皮质柱同步.
  • 超直流刺激 (tDCS) 强调了电流流向在外源EF效应中的重要性.

研究的目的:

  • 为了研究外源电场的方向如何影响皮质调制.
  • 测试皮质柱状组织是EFs方向依赖效应的基础的假设.
  • 探索EF方向和皮质活动调制之间的关系.

主要方法:

  • 在不同方向 (0°,45°,90°) 上对呈缓慢振荡的皮质切片实验应用恒定的外源EFs (±3 V/m).
  • 使用具有双极性质的皮质柱的平均场计算模型进行in silico建模.
  • 分析EF调节效应与应用场方向和皮质结构的关系.

主要成果:

  • 对皮层表面直角应用的外源直流场显示出对皮层活动的最大调节效应.
  • 随着电场的方向偏离直角方向,EF调制的有效性下降,但与表面平行时没有观察到任何效果.
  • 计算机建模成功地重现了实验结果,表明调制与应用EF与二极管垂直轴之间的角度的等比相成比例.

结论:

  • 外源电场的方向极大地影响皮质活动调制.
  • 皮层柱状组织在调解EFs的取决于方向的影响方面发挥着关键作用.
  • 这些发现强调了内源场在理解外源EF对大脑影响方面的重要性.