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Force On A Current Loop In A Magnetic Field01:17

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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...
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Torque On A Current Loop In A Magnetic Field01:13

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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.
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
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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.
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電動モホー (Moho) とは

A G Jones1, I J Ferguson

  • 1Geological Survey of Canada, Ottawa, Ontario. ajones@NRCan.gc.ca

Nature
|February 24, 2001
PubMed
まとめ
この要約は機械生成です。

地震データは地殻マントル境界,またはモホロヴィチッチ不連続 (Moho) を明らかにしますが,電気研究は不確定です. カナダからの新しい電磁気データ.

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科学分野:

  • 地質物理学 地質物理学とは地質物理学です.
  • 地震学 地震学とは
  • 電磁気学は,電磁気学である.

背景:

  • モホロヴィチッチの不連続性 (Moho) は,地震速度の変化によって識別される地球の地殻-マントルの境界をマークします.
  • これまでの電磁学的研究は,モホーで相応の導電性変化を検出できませんでした.
  • 実験室での測定では,モホの導電性コントラストが示唆されており,これはフィールド研究では観察されていません.

研究 の 目的:

  • モホの奥深くにある電磁気シグネチャーを調査するために.
  • 地殻・マントルの境界における地震観測と電磁観測の不一致を調和させるため.
  • 異常なクレートンの下にある最上層のマントルの電気的性質を調査するために.

主な方法:

  • カナダ北部のスレーブ・クラトンからの電磁気データの分析.
  • 観測された伝導性をマントル岩の実験室での測定値と比較.
  • 高解像度モホー画像の作成に,スレーブクラトンの異常な低地殻伝導性を利用した.

主要な成果:

  • モホの深さでは,電気伝導性の明確な段階的変化が検出されました.
  • スレーブ・クラトンは,地殻の総伝導度が非常に低い (<1シーメンス).
  • モホ川の下の上層マントルの導電性は,オリヴィン研究によって予測されたよりも2倍の大きさです.

結論:

  • 電気磁気方法は,モホの伝導率の変化を解決することができます.
  • 最上層のマントルの高い伝導性は,接続された伝導相を示しています.
  • この発見は,地殻マントルの境界の組成と性質に関する既存のモデルに挑戦しています.