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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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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

超伝導的なフィールド効果スイッチ.

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
まとめ
この要約は機械生成です。

科学者たちは,材料を絶縁状態と超伝導状態に切り替える新しいフィールド効果装置を開発しました. このブレークスルーにより,アルカリ金属でドーピングされたC60) の超伝導性が11ケルビンまで可能になった.

さらに関連する動画

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

関連する実験動画

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

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 固体化学 固体化学

背景:

  • 超伝導性は,物質がゼロの電気抵抗を示す量子力学的現象である.
  • 材料の電気的性質を制御し,特に超伝導性を誘導することは,凝縮物質物理学の重要な課題です.
  • フーラーレンは,C{60}のように,独自の電子構造により,電子アプリケーションのための有望な材料です.

研究 の 目的:

  • 断熱状態と超伝導状態の切り替えのための新しいフィールド効果装置を開発する.
  • フィールド効果アプローチを用いて,アルカリ金属ドーピングされたC ((60) の超伝導性を調査する.
  • キャリア濃度とC60における超伝導性の関係を調査する.

主な方法:

  • 活性物質としてC ((60) を使用したフィールド効果装置の製造.
  • 超伝導性の誘導は,アルカリ金属でC (−60) をドーピングすることによって行われる.
  • 電気場を適用して,C60の最も上の分子層のキャリア濃度を制御する.

主要な成果:

  • 単一の材料で絶縁状態と超伝導状態の切り替えを実証した.
  • 11ケルビンまでの温度でアルカリ金属ドーピングされたC ((60) で超伝導性を達成した.
  • 活性層のC60) 分子あたり3個の電子を誘導し,超伝導スイッチを作成しました.

結論:

  • 開発されたフィールド効果装置は,材料の性質を制御するための新しい方法を提供します.
  • このテクニックは,キャリア濃度の関数として超伝導性を研究するための汎用的なプラットフォームを提供します.
  • 断熱状態と超伝導状態の切り替え能力は,新しい電子アプリケーションの道を開く.