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Related Concept Videos

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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Related Experiment Video

Updated: Jun 19, 2026

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

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Published on: July 5, 2024

Persistent currents in normal metal rings.

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
Summary
This summary is machine-generated.

Researchers measured persistent currents in metal rings, confirming quantum mechanics predictions. This breakthrough overcomes experimental challenges, enabling new studies of these fundamental quantum phenomena.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Mesoscopic physics

Background:

  • Quantum mechanics predicts dissipationless persistent currents in resistive metal rings at equilibrium.
  • Studying these currents is challenging due to small signals and environmental sensitivity.
  • Basic properties of persistent currents remain a subject of theoretical and experimental debate.

Purpose of the Study:

  • To develop a novel technique for detecting and measuring persistent currents in metal rings.
  • To investigate the influence of temperature, ring size, and magnetic fields on persistent currents.
  • To experimentally validate theoretical models of persistent currents.

Main Methods:

  • Development of a new experimental technique for sensitive detection of persistent currents.
  • Measurement of persistent currents in individual metal rings and arrays of rings.
  • Comparison of experimental data with theoretical calculations based on a non-interacting electron model.

Main Results:

  • Successful measurement of persistent currents in metal rings across various conditions.
  • Demonstration of a technique robust to environmental noise and capable of detecting small signals.
  • Experimental results show excellent agreement with theoretical predictions for non-interacting electrons.

Conclusions:

  • The developed technique provides a reliable method for studying persistent currents.
  • Experimental findings support the theoretical model of non-interacting electrons in persistent currents.
  • This work advances the understanding of fundamental quantum phenomena in mesoscopic systems.