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Related Concept Videos

Magnetic Force01:18

Magnetic Force

2.0K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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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...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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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.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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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...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: Jan 27, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

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Magnetically controllable slow light based on magnetostrictive forces.

Cui Kong, Bao Wang, Zeng-Xing Liu

    Optics Express
    |March 17, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate tunable slow light using magnetostrictive forces in a cavity system. This allows for adjustable group delays and potential applications in quantum information processing.

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    Area of Science:

    • Quantum optics
    • Condensed matter physics
    • Cavity optomechanics

    Background:

    • The magnetostrictive effect links magnetic and mechanical properties, offering a platform for studying phonon-magnon interactions.
    • Cavity optomechanical systems couple light (photons), magnetic excitations (magnons), and mechanical vibrations (phonons).

    Purpose of the Study:

    • To investigate tunable slow light generation in a cavity magnetomechanical system.
    • To explore the role of nonlinear phonon-magnon interaction driven by magnetostriction.
    • To demonstrate control over light propagation using hybridized photon-magnon modes.

    Main Methods:

    • Utilizing a cavity magnetomechanical system with coupled photon, magnon, and phonon modes.
    • Employing a nonlinear phonon-magnon interaction originating from magnetostrictive forces.
    • Applying strong control fields to induce transparency windows and manipulate light propagation.

    Main Results:

    • Achieved tunable slow light with adjustable group delay by tuning magnon frequencies via external magnetic fields.
    • Observed transparency (absorption) windows for probe light by detuning control fields.
    • Demonstrated control over subluminal and superluminal light propagation by varying control field intensity and frequency.
    • Showcased potential for millisecond-order group delays with increased pump power.

    Conclusions:

    • The study successfully demonstrates tunable slow light in a magnetostrictive cavity system.
    • The findings highlight the potential for coherent information interconversion among photons, phonons, and magnons.
    • This work opens avenues for novel applications in quantum information processing and optical delay lines.