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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.
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.
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.
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
Electrical Current01:10

Electrical Current

Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). An ampere is the...
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.

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Related Experiment Video

Updated: Jun 8, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

Optical fiber microwire current sensor.

M Belal1, Z Song, Y Jung

  • 1ORC, University of Southampton, Southampton, SO17 1BJ, UK. mob@orc.soton.ac.uk

Optics Letters
|September 18, 2010
PubMed
Summary
This summary is machine-generated.

We developed a compact optical fiber microwire sensor using the Faraday effect. This sensor offers gigahertz frequency current sensing capabilities for advanced applications.

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Last Updated: Jun 8, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Physics

Background:

  • Accurate and high-frequency current sensing is crucial for modern electronics and power systems.
  • Traditional current sensors face limitations in bandwidth and miniaturization.

Purpose of the Study:

  • To demonstrate a novel compact optical fiber microwire current sensor.
  • To achieve gigahertz frequency current sensing capabilities.

Main Methods:

  • Utilizing the Faraday effect in an optical fiber microwire.
  • Developing a compact sensor architecture for high-frequency measurements.

Main Results:

  • Successfully demonstrated a compact optical fiber microwire current sensor.
  • Achieved gigahertz frequency current sensing capabilities.

Conclusions:

  • The developed sensor offers a promising solution for high-frequency current monitoring.
  • The compact design and high bandwidth open new possibilities in sensor applications.