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Related Concept Videos

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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Related Experiment Video

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

RETRACTED: A superconducting field-effect switch.

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
Summary
This summary is machine-generated.

Scientists created a novel field-effect device that switches materials between insulating and superconducting states. This breakthrough enables superconductivity in alkali metal-doped C(60) up to 11 kelvin.

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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

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Related Experiment Videos

Last 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

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

Published on: April 16, 2018

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state chemistry

Background:

  • Superconductivity is a quantum mechanical phenomenon where a material exhibits zero electrical resistance.
  • Controlling the electrical properties of materials, especially inducing superconductivity, is a key challenge in condensed matter physics.
  • Fullerenes, like C(60), are promising materials for electronic applications due to their unique electronic structures.

Purpose of the Study:

  • To develop a novel field-effect device for switching between insulating and superconducting states.
  • To investigate superconductivity in alkali metal-doped C(60) using a field-effect approach.
  • To explore the relationship between carrier concentration and superconductivity in C(60).

Main Methods:

  • Fabrication of a field-effect device utilizing C(60) as the active material.
  • Induction of superconductivity by doping C(60) with alkali metals.
  • Application of electric fields to control carrier concentration in the topmost molecular layer of C(60).

Main Results:

  • Demonstrated switching between insulating and superconducting states in a single material.
  • Achieved superconductivity in alkali metal-doped C(60) at temperatures up to 11 kelvin.
  • Successfully induced three electrons per C(60) molecule in the active layer, creating a superconducting switch.

Conclusions:

  • The developed field-effect device offers a new method for controlling material properties.
  • This technique provides a versatile platform for studying superconductivity as a function of carrier concentration.
  • The ability to switch between insulating and superconducting states opens avenues for novel electronic applications.