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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.
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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...
Magnetic Field Lines01:19

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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 due to Moving Charges01:25

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...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

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Published on: April 4, 2013

Deslizamiento de la reconexión magnética en bucles coronales.

Guillaume Aulanier1, Leon Golub, Edward E Deluca

  • 1Observatoire de Paris, Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie (UPMC), Université Paris Diderot, 92190 Meudon, France. guillaume.aulanier@obspm.fr

Science (New York, N.Y.)
|December 8, 2007
PubMed
Resumen

Las erupciones solares son causadas por la reconexión magnética. Nuevas evidencias sugieren que un proceso de reconexión magnética deslizante, donde las líneas de campo se deslizan una al lado de la otra, es clave para entender las erupciones solares y el calentamiento coronal.

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Área de la Ciencia:

  • La física del plasma es la física del plasma.
  • Física solar Física solar es la física de la energía solar.
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • La reconexión magnética en los bucles coronales solares impulsa las llamaradas solares y el calentamiento coronal.
  • El modelo estándar asume la ruptura instantánea de la línea de campo magnético en mapeos de campo discontinuos.
  • Un modo alternativo de reconexión magnética deslizante puede ocurrir con gradientes de campo continuos pero empinados.

Objetivo del estudio:

  • Para investigar la existencia y las implicaciones del resbalón de la reconexión magnética en la corona del Sol.
  • Proporcionar apoyo observacional para el modelo de reconexión magnética deslizante.
  • Para informar las interpretaciones de la reconexión magnética en plasmas solares y de laboratorio.

Principales métodos:

  • Análisis de las observaciones de rayos X suaves de la nave espacial Hinode.
  • Observación de los rápidos movimientos bidireccionales de los bucles coronales.
  • Comparación de los fenómenos observados con los modelos teóricos de reconexión magnética.

Principales resultados:

  • Los movimientos bidireccionales rápidos observados de los bucles coronales proporcionan evidencia de una reconexión magnética deslizante.
  • Este régimen funciona donde el mapeo del campo magnético es continuo pero tiene gradientes pronunciados.
  • Soporta una alternativa al modelo estándar de reconexión instantánea.

Conclusiones:

  • La reconexión magnética deslizante es un proceso viable en la corona solar.
  • Este mecanismo debe considerarse al estudiar las erupciones solares y el calentamiento coronal.
  • Los hallazgos son relevantes tanto para los estudios de reconexión de plasma solar como para los de laboratorio.