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相关概念视频

Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
Induced Electric Fields01:23

Induced Electric Fields

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...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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...
Electromagnetic Fields01:30

Electromagnetic Fields

Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of Gauss's...

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相关实验视频

Updated: Jul 5, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

一个超导电场效应开关.

J H Schon1, C Kloc, R C Haddon

  • 1Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA. Departments of Chemistry and Physics and Advanced Carbon Materials Center, University of Kentucky, Lexington, KY 40506, USA.

Science (New York, N.Y.)
|April 28, 2000
PubMed
概括
此摘要是机器生成的。

科学家们创造了一种新的场效应装置,可以在绝缘和超导状态之间切换材料. 这一突破使金属合的C60) 在高达11克尔文的温度下具有超导性.

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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

Published on: April 16, 2018

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

相关实验视频

Last Updated: Jul 5, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
09:00

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

Published on: April 16, 2018

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 是一种材料科学.
  • 固态化学 固态化学

背景情况:

  • 超导是一种量子力学现象,其中一个材料表现出零电阻.
  • 控制材料的电特性,特别是诱导超导,是凝聚物质物理学中的一个关键挑战.
  • 富勒,如C 60),由于其独特的电子结构,是电子应用的有希望的材料.

研究的目的:

  • 开发一种用于在绝缘和超导状态之间切换的新型场效应装置.
  • 通过使用场效应方法,研究金属合的C ((60) 中的超导性.
  • 探索载体度和C60中的超导性之间的关系.

主要方法:

  • 制造一种使用C60) 作为活性物质的场效应装置.
  • 通过用性金属化C(60) 来诱导超导.
  • 电场的应用,以控制载体度在最顶层的分子层C 60).

主要成果:

  • 在单一材料中证明了绝缘和超导状态之间的切换.
  • 在高达11克尔文的温度下,在金属合的C ((60) 中达到超导性.
  • 在活性层中成功诱导了每个C60) 分子中的三个电子,创建了一个超导开关.

结论:

  • 开发的场效应装置为控制材料特性提供了一种新方法.
  • 这种技术为研究超导作为载体度的函数提供了一个多功能平台.
  • 在绝缘和超导状态之间切换的能力为新的电子应用开辟了道路.