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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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 Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Video Experimental Relacionado

Updated: Jun 19, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit
04:35

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Published on: July 5, 2024

Las corrientes constantes en los anillos metálicos normales.

A C Bleszynski-Jayich1, W E Shanks, B Peaudecerf

  • 1Department of Physics, Yale University, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|October 10, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores midieron corrientes persistentes en anillos metálicos, confirmando las predicciones de la mecánica cuántica. Este avance supera los desafíos experimentales, permitiendo nuevos estudios de estos fenómenos cuánticos fundamentales.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • La mecánica cuántica es la mecánica cuántica.
  • La física mesoscópica es una física.

Sus antecedentes:

  • La mecánica cuántica predice corrientes persistentes sin disipación en anillos metálicos resistentes en equilibrio.
  • El estudio de estas corrientes es un desafío debido a las pequeñas señales y la sensibilidad ambiental.
  • Las propiedades básicas de las corrientes persistentes siguen siendo objeto de debate teórico y experimental.

Objetivo del estudio:

  • Desarrollar una nueva técnica para detectar y medir corrientes persistentes en anillos metálicos.
  • Para investigar la influencia de la temperatura, el tamaño del anillo y los campos magnéticos en las corrientes persistentes.
  • Para validar experimentalmente los modelos teóricos de las corrientes persistentes.

Principales métodos:

  • Desarrollo de una nueva técnica experimental para la detección sensible de corrientes persistentes.
  • Medición de corrientes persistentes en anillos metálicos individuales y conjuntos de anillos.
  • Comparación de datos experimentales con cálculos teóricos basados en un modelo de electrones que no interactúan.

Principales resultados:

  • Medición exitosa de corrientes persistentes en anillos metálicos en diversas condiciones.
  • Demostración de una técnica resistente al ruido ambiental y capaz de detectar señales pequeñas.
  • Los resultados experimentales muestran un excelente acuerdo con las predicciones teóricas para los electrones que no interactúan.

Conclusiones:

  • La técnica desarrollada proporciona un método fiable para el estudio de las corrientes persistentes.
  • Los hallazgos experimentales apoyan el modelo teórico de electrones no interactuantes en corrientes persistentes.
  • Este trabajo avanza en la comprensión de los fenómenos cuánticos fundamentales en sistemas mesoscópicos.