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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...
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...
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Electromagnetic Fields01:30

Electromagnetic Fields

Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of Gauss's...

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Video Experimental Relacionado

Updated: Jul 5, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

Un interruptor de efecto de campo superconductor de efecto de campo.

J H Schon1, C Kloc, R C Haddon

  • 1Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA. Departments of Chemistry and Physics and Advanced Carbon Materials Center, University of Kentucky, Lexington, KY 40506, USA.

Science (New York, N.Y.)
|April 28, 2000
PubMed
Resumen
Este resumen es generado por máquina.

Los científicos crearon un nuevo dispositivo de efecto de campo que cambia los materiales entre los estados aislantes y superconductores. Este avance permite la superconductividad en el C60) dopado con metales alcalinos hasta 11 kelvin.

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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
  • Ciencia de los materiales ciencia de los materiales.
  • Química del estado sólido.

Sus antecedentes:

  • La superconductividad es un fenómeno mecánico cuántico en el que un material exhibe una resistencia eléctrica cero.
  • El control de las propiedades eléctricas de los materiales, especialmente la inducción de superconductividad, es un desafío clave en la física de la materia condensada.
  • Los fullerenos, como el C60, son materiales prometedores para aplicaciones electrónicas debido a sus estructuras electrónicas únicas.

Objetivo del estudio:

  • Desarrollar un nuevo dispositivo de efecto de campo para cambiar entre estados aislantes y superconductores.
  • Para investigar la superconductividad en el metal alcalino dopado C ((60) utilizando un enfoque de efecto de campo.
  • Para explorar la relación entre la concentración del portador y la superconductividad en C 60).

Principales métodos:

  • Fabricación de un dispositivo de efecto de campo utilizando C60) como el material activo.
  • Inducción de la superconductividad mediante el dopaje de C ((60) con metales alcalinos.
  • Aplicación de campos eléctricos para controlar la concentración del portador en la capa molecular más alta de C 60).

Principales resultados:

  • Cambio demostrado entre estados aislantes y superconductores en un solo material.
  • Se ha logrado superconductividad en metales alcalinos dopados con C60) a temperaturas de hasta 11 kelvin.
  • Inducido con éxito tres electrones por molécula de C60) en la capa activa, creando un interruptor superconductor.

Conclusiones:

  • El dispositivo de efecto de campo desarrollado ofrece un nuevo método para controlar las propiedades de los materiales.
  • Esta técnica proporciona una plataforma versátil para estudiar la superconductividad en función de la concentración del portador.
  • La capacidad de cambiar entre estados aislantes y superconductores abre caminos para nuevas aplicaciones electrónicas.