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相关概念视频

Electric Field Lines01:25

Electric Field Lines

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The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
The solution to this problem is to use electric field lines, which are not vectors but...
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Series R—L Circuit Transients01:22

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In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
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Magnetic Field Lines01:19

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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.
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Electric Field01:16

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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
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相关实验视频

Updated: Dec 12, 2025

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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在木星的浅层电风中发出小小的闪电

Heidi N Becker1, James W Alexander2, Sushil K Atreya3

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. Heidi.N.Becker@jpl.nasa.gov.

Nature
|August 8, 2020
PubMed
概括
此摘要是机器生成的。

木星

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科学领域:

  • 星球科学
  • 大气科学
  • 血物理

背景情况:

  • 之前的木星闪电观测受限于相机的灵敏度和距离.
  • 估计闪光速率为每公里4×10−3,空间范围为30公里.
  • 闪光被解释为5巴附近的潮湿对流的痕迹.

研究的目的:

  • 报告朱诺航天器对木星闪电的新观测结果.
  • 用前所未有的细节来描述闪电的能量,持续时间和速度.
  • 调查木星闪电的大气起源和产生机制.

主要方法:

  • 使用朱诺航天器的光学仪器来探测闪电.
  • 分析的闪光能量在105108之间.
  • 测量闪光持续时间为5.4毫秒,闪光间隔时间为毫秒.

主要成果:

  • 观测到木星闪电速率为6.1×10−2每公里2/年,比之前报告的高出一个数量级.
  • 检测到空间范围较小的闪光,
  • 测量到的闪电能量相当于地球上的闪电.

结论:

  • 星闪电的发生率远高于此前的估计.
  • 闪电在2巴以上的水平表明水对闪电产生并不重要.
  • 在木星大气层中可能存在多种发电机制, 需要对大气对流和组成进行进一步的研究.