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Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Lines01:19

Magnetic Field Lines

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.
Magnetic field lines follow several hard-and-fast rules:
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Video Experimental Relacionado

Updated: Jun 30, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Separación de la fuente magnética en el núcleo externo de la Tierra.

Kenneth A Hoffman1, Brad S Singer

  • 1Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA. khoffman@calpoly.edu

Science (New York, N.Y.)
|September 27, 2008
PubMed
Resumen
Este resumen es generado por máquina.

El campo de dipolo axial de la Tierra se origina por separado del campo de dipolo no axial (NAD). Esta separación del campo geomagnético sugiere distintos procesos de dinamo dentro del núcleo de la Tierra.

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
  • El geomagnetismo es el geomagnetismo.

Sus antecedentes:

  • El campo magnético de la Tierra es generado principalmente por la geodinamo en el núcleo externo líquido.
  • El campo geomagnético comprende un componente de dipolo axial y un componente más complejo de dipolo no axial (NAD).
  • Comprender las fuentes distintas de estos componentes es crucial para interpretar los datos paleomagnéticos y la dinámica central.

Objetivo del estudio:

  • Investigar la independencia de la fuente de campo del dipolo axial de la Tierra de las fuentes de campo del dipolo no axial (NAD).
  • Explorar las implicaciones de esta independencia para la comprensión de las interacciones entre la geodinámica y el manto central.
  • Proporcionar un nuevo marco para el análisis del comportamiento del campo geomagnético.

Principales métodos:

  • Análisis de correlación entre la estructura histórica del campo geomagnético y el comportamiento del campo paleomagnético.
  • Examen de flujos de lava fechados con precisión que capturan períodos de campos de dipolo axial débiles o ausentes.
  • Modelado geofísico para inferir la estratificación de las fuentes magnéticas dentro del núcleo fluido de la Tierra.

Principales resultados:

  • La evidencia sugiere que el campo de dipolo axial es en gran medida independiente de las fuentes que generan el campo NAD.
  • El campo de dipolo axial parece significativamente menos influenciado por el manto más bajo en comparación con el campo NAD.
  • Se propone una estratificación de las fuentes magnéticas dentro del núcleo fluido, siendo el dipolo axial una capa distinta.

Conclusiones:

  • El campo de dipolo axial de la Tierra y el campo de dipolo no axial (NAD) se originan en procesos en gran medida separados dentro del núcleo.
  • La inmunidad relativa del campo de dipolo axial a las influencias del manto más bajo apoya un modelo de dinamo de núcleo estratificado.
  • Los futuros modelos de campo geomagnético deberían tener en cuenta esta dicotomía en los procesos de dinamo espacio-temporal.