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Related Concept Videos

Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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 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 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.
Directional Relays01:25

Directional Relays

Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...

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Related Experiment Video

Updated: Jun 19, 2026

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

Faraday current sensor that uses a triangular-shaped bulk-optic sensing element.

B C Chu, Y N Ning, D A Jackson

    Optics Letters
    |October 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel triangular topology for bulk-optic Faraday current sensors offers improved resolution and ease of fabrication. This new design surpasses limitations of square configurations and all-fiber systems for accurate current measurement.

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    Last Updated: Jun 19, 2026

    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Published on: November 7, 2016

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
    09:03

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    Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
    08:32

    Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

    Published on: January 29, 2013

    Area of Science:

    • Optics
    • Sensor Technology
    • Electrical Engineering

    Background:

    • Current sensors are crucial for electrical system monitoring.
    • Existing bulk-optic and all-fiber sensors face limitations in resolution and fabrication.

    Purpose of the Study:

    • To introduce a new triangular topology for bulk-optic Faraday current sensors.
    • To demonstrate the sensor's performance and advantages over existing technologies.

    Main Methods:

    • Development of a triangular bulk-optic Faraday current sensor.
    • Experimental validation of sensor resolution and sensitivity.

    Main Results:

    • Demonstrated resolution of 20 mA/√Hz over a 1-3000 A range.
    • Achieved sensitivity of 2.35 x 10⁻⁵ rad/A.
    • The sensor is easier to fabricate than square configurations.

    Conclusions:

    • The triangular topology offers a practical and high-performance solution for Faraday current sensing.
    • This design overcomes drawbacks of previous bulk-optic and fiber-optic sensor systems.