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Related Concept Videos

Induction01:16

Induction

6.0K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
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Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Related Experiment Video

Updated: Mar 24, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

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No effects of surround complexity on brown induction.

Takuma Morimoto, Emily Slezak, Steven L Buck

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |March 15, 2016
    PubMed
    Summary

    Brown color perception occurs when a yellow stimulus is darker than its surroundings. Complex surrounds do not change brown induction, which depends only on the total light in a constant-sized surround area.

    Area of Science:

    • Visual perception
    • Color science
    • Psychophysics

    Background:

    • Brown color induction is typically studied with simple, contiguous surrounds.
    • The influence of complex or distant surround features on brown induction is not well understood.

    Purpose of the Study:

    • To investigate how complex achromatic surround stimuli influence brown color induction.
    • To determine the critical factors controlling brown induction beyond simple contiguous surrounds.

    Main Methods:

    • Experimentally manipulated achromatic surround stimuli with varying complexity.
    • Presented participants with a yellow test stimulus and varied surround configurations.
    • Assessed the conditions under which the yellow stimulus was perceived as brown.

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    Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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    Main Results:

    • The area immediately adjacent to the test stimulus significantly impacts brown induction.
    • Neither the number of surround features nor their spatial distribution affected brown induction.
    • Brown induction was dependent on the total amount of light within a constant-sized surround region.

    Conclusions:

    • Brown induction is primarily driven by the overall luminance within a defined surround area, not its complexity or distribution.
    • These findings suggest distinct mechanisms for brown and brightness induction.
    • Future research should explore the role of total surround luminance in other color induction phenomena.