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Related Concept Videos

Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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The Electromagnetic Spectrum02:37

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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The Electromagnetic Spectrum01:24

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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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Electromagnetic Waves01:30

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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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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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Plane Electromagnetic Waves II01:29

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Electromagnetic fields and melatonin production

R J Reiter1

  • 1Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78284-7762.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

Exposure to light or electromagnetic fields at night can lower melatonin production in the pineal gland. This reduction may have physiological consequences, as melatonin is a potent antioxidant with potential cancer-protective effects.

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Area of Science:

  • Neuroendocrinology
  • Environmental Health

Background:

  • The pineal gland, centrally located in the brain, regulates melatonin production.
  • Melatonin production follows a diurnal rhythm, with high levels at night and low levels during the day.
  • This rhythm is influenced by light exposure via neural pathways connected to the eyes.

Purpose of the Study:

  • To investigate the effects of light and electromagnetic fields on pineal melatonin production.
  • To understand the physiological implications of altered melatonin levels.

Main Methods:

  • Observational studies on humans and mammals exposed to light at night.
  • Experimental studies on non-human mammals exposed to various electromagnetic fields (sinusoidal electric/magnetic, pulsed static magnetic).

Main Results:

  • Exposure to light at night reduces pineal melatonin production and blood melatonin levels in humans and mammals.
  • Exposure to electromagnetic fields often reduces pineal melatonin production in non-human mammals.

Conclusions:

  • Environmental factors, including light and electromagnetic fields, can disrupt the natural rhythm of melatonin production.
  • Reduced melatonin levels may have significant physiological consequences due to its role as an antioxidant.
  • Further research is needed to confirm a link between electromagnetic field exposure, reduced melatonin, and cancer risk.