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Related Concept Videos

Toroids01:27

Toroids

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A toroid is a closely wound donut-shaped coil constructed using a single  conducting wire. In general, it is assumed that a toriod consists of  multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in...
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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.
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Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

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The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
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Magnetic Field Due to Two Straight Wires01:18

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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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Magnetic Field Of A Current Loop01:16

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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.
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Magnetic Field Due To A Thin Straight Wire01:28

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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.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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A Toroidal Metamaterial Switch.

Manoj Gupta1,2, Yogesh Kumar Srivastava1,2, Ranjan Singh1,2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|December 7, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed an active toroidal metamaterial switch. This device dynamically switches toroidal dipoles to electric or magnetic dipoles, enabling new control over electromagnetic waves for applications in lasers and sensors.

Keywords:
anapoleselectric dipolesmagnetic dipolestoroidal dipoles

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Area of Science:

  • Metamaterials
  • Electromagnetism
  • Condensed Matter Physics

Background:

  • Toroidal dipoles are localized electromagnetic excitations characterized by poloidal currents on a torus.
  • They represent a distinct class of excitation, differing from traditional electric and magnetic dipoles.
  • Toroidal dipoles have unique potential for creating nearly nonradiating charge-current configurations.

Purpose of the Study:

  • To demonstrate an active toroidal metamaterial switch.
  • To achieve dynamic switching between toroidal, electric, and magnetic dipole responses.
  • To explore applications in controlling electromagnetic excitations.

Main Methods:

  • Design of a hybrid metamolecule incorporating active elements.
  • Selective inclusion of active components to control dipole response.
  • Demonstration of dynamic switching capabilities of the metamaterial.

Main Results:

  • Successfully demonstrated an active metamaterial switch capable of toroidal dipole manipulation.
  • Achieved dynamic switching of the toroidal dipole to fundamental electric and magnetic dipole modes.
  • Showcased the transition from a nonradiating toroidal configuration to radiating electric and magnetic dipoles.

Conclusions:

  • The active toroidal metamaterial switch offers dynamic control over electromagnetic excitations.
  • This switching capability has significant implications for controlling electromagnetic interactions in free space and matter.
  • Potential applications include the development of advanced lasers, sensors, filters, and modulators.