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Videos de Conceptos Relacionados

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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.
The vector...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...
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:
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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Published on: December 22, 2018

Un chorro magnetizado de una protoestrella masiva.

Carlos Carrasco-González1, Luis F Rodríguez, Guillem Anglada

  • 1Instituto Astrofísica Andalucía, Consejo Superior de Investigaciones Científicas (CSIC), Camino Bajo de Huétor 50, E-18008 Granada, Spain. charly@iaa.es

Science (New York, N.Y.)
|November 27, 2010
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores encontraron la emisión polarizada de sincrotrones en los chorros de objetos estelares jóvenes, similar a los chorros de núcleos galácticos activos. Esto sugiere un origen común para todos los chorros astrofísicos, proporcionando nuevos conocimientos sobre la formación de chorros y los campos magnéticos.

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Área de la Ciencia:

  • La astrofísica es la astrofísica.
  • Física del plasma es la física del plasma.

Sus antecedentes:

  • La emisión de sincrotrones es un fenómeno conocido en los chorros de núcleos galácticos activos (AGN) y microcuásares.
  • La presencia de emisión de sincrotrones en los chorros de objetos estelares jóvenes (YSOs) no ha sido confirmada previamente.

Objetivo del estudio:

  • Para presentar evidencia de la emisión de sincrotrones polarizados en un chorro YSO.
  • Para investigar las propiedades del campo magnético y la configuración dentro de los chorros YSO.
  • Para comparar las características de los chorros YSO con las de los chorros AGN.

Principales métodos:

  • Astronomía observacional que utiliza las mediciones de polarización.
  • Análisis de las propiedades de la emisión de sincrotrones.
  • Determinación de la intensidad y orientación del campo magnético.

Principales resultados:

  • Pruebas de emisión polarizada de sincrotrones detectadas en un chorro YSO.
  • Una fuerza de campo magnético aparente de aproximadamente 0,2 milligauss, alineada con el eje del chorro.
  • Aumento del grado de polarización hacia los bordes de los chorros, consistente con un campo magnético helicoidal.

Conclusiones:

  • Los hallazgos proporcionan la primera prueba de la emisión de sincrotrones en los chorros YSO.
  • Las características observadas se asemejan a las de los chorros de AGN, lo que sugiere un modelo unificado para los chorros astrofísicos.
  • Esto implica un mecanismo físico común que subyace a la formación y evolución de todos los chorros astrofísicos.