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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 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.
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Meridians01:28

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In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
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The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
Magnetic Declination01:19

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Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
Local Attraction01:22

Local Attraction

Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...

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Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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Navegación: orientación del murciélago utilizando el campo magnético de la Tierra.

Richard A Holland1, Kasper Thorup, Maarten J Vonhof

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544, USA. rahollan@princeton.edu

Nature
|December 8, 2006
PubMed
Resumen
Este resumen es generado por máquina.

Los grandes murciélagos marrones (Eptesicus fuscus) utilizan una brújula magnética para la navegación de larga distancia. Cambiar artificialmente el campo magnético de la Tierra alteró su comportamiento de búsqueda, confirmando esta dependencia.

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Área de la Ciencia:

  • Zoología Zoología Zoología.
  • Comportamiento animal Comportamiento animal.
  • Biología Sensorial Biología Sensorial

Sus antecedentes:

  • Los murciélagos navegan principalmente utilizando la ecolocalización para la orientación de corto alcance.
  • Los mecanismos de navegación de larga distancia en los murciélagos siguen siendo en gran medida desconocidos.
  • Eptesicus fuscus, el gran murciélago marrón, exhibe un comportamiento de búsqueda.

Objetivo del estudio:

  • Para investigar los mecanismos sensoriales que subyacen a la navegación de larga distancia en Eptesicus fuscus.
  • Para determinar si los murciélagos utilizan una brújula magnética para orientarse.

Principales métodos:

  • Manipulación experimental del campo magnético de la Tierra.
  • Observación del comportamiento de búsqueda en Eptesicus fuscus bajo condiciones magnéticas alteradas.

Principales resultados:

  • Los cambios artificiales en el campo magnético de la Tierra alteraron significativamente el comportamiento de los grandes murciélagos marrones.
  • Esto demuestra un vínculo directo entre la percepción del campo magnético y la dirección de navegación.

Conclusiones:

  • Eptesicus fuscus se basa en una brújula magnética para una navegación efectiva a larga distancia.
  • Este hallazgo destaca las sofisticadas capacidades sensoriales de los murciélagos para la navegación nocturna.