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関連する概念動画

Coulomb's Law01:30

Coulomb's Law

Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved.
Newton's third law applies to the Coulomb force — the force on...
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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.
Magnetic Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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関連する実験動画

Updated: Jul 26, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

一次元のワイヤの負のクーロン引力です.

M Yamamoto1, M Stopa, Y Tokura

  • 1Department of Applied Physics, University of Tokyo, Bunkyoku, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|July 15, 2006
PubMed
まとめ

電子が反対方向に流れる量子ワイヤの負のクーロン引力を観察しました. 強い相関条件下で発生するこの現象は,ウィネナー結晶と粒子のような状態を含む新しいモデルを示唆しています.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 量子力学は,量子力学という
  • メソスコピック物理学

背景:

  • クーロンブ抵抗は,別々の導体内の電荷载体間の相互作用を測定する.
  • 標準理論は,モメンタム移転に基づいてドラッグを説明し,典型的にはプラスのドラッグを予測します.
  • 負のクーロンブ抵抗を観測すると,従来のモデルの分解が示されます.

研究 の 目的:

  • 平行結合量子ワイヤの負のクーロン引力現象を調査する.
  • 負のクーロン阻力が発生する条件を調査する.
  • この非常識な観測を説明する新しい理論モデルを提案する.

主な方法:

  • パラレル量子ワイヤ内の対極方向の電子の流れの実験的観測.
  • 電子密度,磁場,温度などの条件を体系的に変化させる.
  • 相関する電子状態を組み込む理論的モデリング.

主要な成果:

  • Negative Coulomb dragは,強い電子相関 (低密度,高磁場,低温) の条件下でのみ観察されました.
  • 観測された効果は,標準的な運動量移転理論で説明できませんでした.
  • 新しいモデルが提案され,一方のワイヤのウィーナー結晶形成と,もう一方のワイヤの粒子のような状態を考慮した.

さらに関連する動画

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
09:14

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

Published on: December 7, 2017

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

関連する実験動画

Last Updated: Jul 26, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
09:14

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

Published on: December 7, 2017

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

結論:

  • 強い電子相関は,このシステムにおける負のクーロン引力を観測するために重要である.
  • 提案されたモデルは,観測された負のクーロン引力に対する潜在的な説明を提供する.
  • この発見は,量子システムにおける電子の相互作用を理解するための新しい道を開きます.