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Related Concept Videos

Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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Free-space nonperpendicular electric-magnetic fields.

Uri Levy, Yaron Silberberg

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |September 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Electromagnetic waves in free space are not always perpendicular. This study derives nonperpendicular electric and magnetic fields, challenging the common assumption for certain wave types like Bessel-related fields.

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    Area of Science:

    • Electromagnetism
    • Wave Physics

    Background:

    • The common understanding is that electric and magnetic field components of electromagnetic waves in free space are perpendicular.
    • This perpendicularity is a fundamental concept often associated with plane waves.

    Purpose of the Study:

    • To investigate the relationship between electric and magnetic field components in free-space electromagnetic waves.
    • To derive and analyze nonperpendicular electric-magnetic fields using electromagnetic potentials.

    Main Methods:

    • Construction of electromagnetic potentials.
    • Derivation of free-space electric and magnetic fields from these potentials.
    • Analysis of field component angles in Bessel-related fields near the origin.

    Main Results:

    • Free-space electromagnetic potentials can yield nonperpendicular electric and magnetic fields.
    • In Bessel-related fields, the angle between electric and magnetic components near the origin ranges from 7° to 173°.
    • Plane waves, analyzed similarly, confirm perpendicular electric and magnetic fields.

    Conclusions:

    • The assumption of perpendicular electric and magnetic fields in free space is not universally applicable.
    • Nonperpendicular field configurations exist for certain types of electromagnetic waves, such as Bessel-related fields.
    • Distinction between plane waves and other free-space wave types regarding field component orientation is highlighted.