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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Gauss's law helps determine electric fields even though the law is not directly about electric fields but electric flux. In situations with certain symmetries (spherical, cylindrical, or planar) in the charge distribution, the electric field can be deduced based on the knowledge of the electric flux. In these systems, we can find a Gaussian surface S over which the electric field has a constant magnitude. Furthermore, suppose the electric field is parallel (or antiparallel) to the area vector...
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A voltmeter is an electrical device that measures the potential difference or voltage between two points. It is connected in parallel with the circuit element it is measuring. A parallel connection is used because elements in parallel experience the same potential difference. The voltmeter is represented by the symbol "V ".
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Los sensores de Megagauss son muy potentes.

A Husmann1, J B Betts, G S Boebinger

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

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PubMed
Resumen
Este resumen es generado por máquina.

Los calogenuros de plata, como el Ag2Se, muestran un aumento dramático, casi lineal, en la resistencia eléctrica cuando se exponen a campos magnéticos. Esto los hace prometedores para el desarrollo de sensores de campo magnético altamente sensibles.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • Física del estado sólido Física del estado sólido

Sus antecedentes:

  • Los campos magnéticos influyen en el comportamiento de los electrones en los sólidos, ofreciendo información sobre la estructura electrónica.
  • Los calogenuros de plata (Ag2Se, Ag2Te) no son magnéticos, pero pueden exhibir sensibilidad de campo con un dopaje mínimo de plata.

Objetivo del estudio:

  • Para investigar la respuesta del campo magnético del selenuro de plata (Ag2Se).
  • Para explorar el potencial de los calcogenuros de plata dopados como sensores de campo magnético.

Principales métodos:

  • Mediciones de la resistencia eléctrica en Ag2Se bajo campos magnéticos altos (hasta 600.000 gauss).
  • Estudios a baja temperatura para observar las oscilaciones de magnetoresistencia y el comportamiento de escalado.

Principales resultados:

  • Ag2Se demostró un aumento grande (miles de por ciento) y casi lineal en la resistencia con el campo magnético, sin mostrar saturación.
  • Oscilaciones observadas en la magnetorresistencia y una forma de escala universal en campos altos y bajas temperaturas.

Conclusiones:

  • La magnetorresistencia observada en Ag2Se sugiere un origen cuántico para su comportamiento sin precedentes.
  • Los calcogenuros de plata dopados son candidatos atractivos para los sensores de campo magnético, en particular para la calibración de intensos campos magnéticos pulsados.