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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
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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.
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Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
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Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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.
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Video Experimental Relacionado

Updated: Jun 29, 2026

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
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Inversiones magnéticas y extinciones masivas.

D M Raup1

  • 1Department of the Geophysical Sciences, University of Chicago, Illinois 60637, USA.

Nature
|March 28, 1985
PubMed
Resumen

Las inversiones del campo magnético de la Tierra muestran un ciclo consistente de 30 millones de años. Esta periodicidad en la escala de tiempo geológico predice futuros pulsos de mayor actividad del campo magnético, potencialmente vinculados a eventos de extinción biológica.

Área de la Ciencia:

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

Sus antecedentes:

  • El análisis del tiempo de inversión del campo magnético de la Tierra ha producido resultados contradictorios con respecto a la periodicidad.
  • Algunos estudios sugieren una periodicidad de 10 millones de años, mientras que otros encuentran espaciados aleatorios.
  • Los vínculos potenciales entre las inversiones de campo magnético y los eventos de extinción biológica merecen una investigación adicional.

Objetivo del estudio:

  • Para analizar la distribución temporal de las inversiones del campo magnético de la Tierra en los últimos 165 millones de años.
  • Para identificar cualquier periodicidad significativa en el registro de inversión magnética.
  • Evaluar las implicaciones de las periodicidades identificadas para la comprensión de los procesos dinámicos de la Tierra y su impacto potencial.

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Principales métodos:

  • Análisis de series de tiempo de datos paleomagnéticos.
  • Examen estadístico del registro de inversión magnética de la Tierra que abarca 165 millones de años.
  • Identificación y caracterización de señales periódicas dentro de los datos de inversión.

Principales resultados:

  • Se identificó una periodicidad estacionaria de 30 millones de años en el registro de inversión magnética.
  • Este ciclo de 30 millones de años se superpone a las no estacionalidades previamente establecidas.
  • El estudio predice pulsos de mayor actividad de inversión magnética a intervalos específicos (10, 40, 70 millones de años antes del presente).

Conclusiones:

  • El proceso de inversión del campo magnético de la Tierra exhibe una periodicidad significativa de 30 millones de años.
  • Esta periodicidad proporciona un marco predictivo para la futura actividad de reversión.
  • Los hallazgos contribuyen a comprender el comportamiento de la geodinamo a largo plazo y su posible correlación con los principales eventos terrestres.