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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Motional Emf01:22

Motional Emf

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 magnetic...
Electromagnetic Fields01:30

Electromagnetic Fields

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.
However, the observation of Gauss's...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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: May 24, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
13:29

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Published on: May 15, 2021

Magnetic and electromagnetic field therapy.

M S Markov1, A P Colbert

  • 1EMF Therapeutics, Chattanooga, TN 37405, USA.

Journal of Back and Musculoskeletal Rehabilitation
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

Magnetotherapy uses non-invasive magnetic fields for safe, effective treatment of pain and inflammation. This review covers decades of research on biological effects, dosimetry, and mechanisms of magnetic field therapy.

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Last Updated: May 24, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
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Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy
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Area of Science:

  • Biomedical Engineering
  • Electrophysiology
  • Therapeutic Modalities

Background:

  • Growing interest in therapeutic applications of magnetic and electromagnetic fields.
  • Magnetotherapy offers non-invasive, safe, and easily applicable treatment methods.
  • Addresses direct treatment of injury sites, pain, inflammation, and dysfunction.

Purpose of the Study:

  • To review decades of global research on biological and clinical effects of magnetic/electromagnetic fields.
  • To discuss the physiological basis of tissue repair and physical principles of magnetic field application.
  • To analyze magnetic/electromagnetic stimulation and compare it with electric current stimulation.

Main Methods:

  • Comprehensive literature review of studies on magnetic/electromagnetic field effects.
  • Analysis of physiological and physical principles related to magnetotherapy.
  • Comparative evaluation of magnetic field stimulation versus electrical stimulation.

Main Results:

  • Summarizes extensive worldwide experience in magnetotherapy.
  • Discusses physiological basis for tissue repair and magnetic field dosimetry.
  • Highlights advantages of magnetic field stimulation over electrical stimulation.

Conclusions:

  • Magnetotherapy presents a safe and effective therapeutic option.
  • Understanding the mechanisms of action is crucial for optimizing treatment.
  • Further research into magnetic field therapy holds significant potential.