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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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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 Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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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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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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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Related Experiment Video

Updated: Feb 20, 2026

Construction of Microdrive Arrays for Chronic Neural Recordings in Awake Behaving Mice
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Near-zero-index wires.

Luigi La Spada, Lucio Vegni

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    Researchers explored near-zero-index materials to create novel electromagnetic functionalities. These epsilon-mu-near-zero materials enable efficient waveguides with low attenuation and broad bandwidth for nanocircuits.

    Area of Science:

    • Electromagnetism
    • Materials Science
    • Nanotechnology

    Background:

    • Near-zero-index (NZI) materials exhibit unique electromagnetic properties.
    • Exploiting NZI material boundaries can lead to novel functionalities.
    • Dielectric rod waveguides are fundamental components in various applications.

    Purpose of the Study:

    • To analyze the electromagnetic guiding properties of a dielectric rod waveguide.
    • To investigate the effect of a surrounding epsilon-mu-near-zero shell.
    • To develop a model for designing such waveguide structures.

    Main Methods:

    • Analysis of near-zero-index material boundary properties.
    • Development of a closed-form solution for the dispersion equation.
    • Analytical and numerical simulations of the waveguide structure.

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    Main Results:

    • Demonstration of extraordinary guiding properties using NZI shells.
    • Achieved low attenuation and wide bandwidth.
    • Observed unique field configurations.

    Conclusions:

    • The proposed structure offers efficient waveguiding capabilities.
    • NZI materials enable advanced electromagnetic functionalities.
    • Potential applications in nanocircuits and advanced electronics.