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Magnetic Fields

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...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

Induction

Induction

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...

Energy In A Magnetic Field

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...

Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

Electromagnetic Fields

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...

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Related Experiment Video

Updated: Jun 12, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Published on: May 15, 2021

[Incursion into bioelectromagnetism].

Neguţa Goldura¹, Stela Goţia

¹Universităţii de Medicină şi Farmacie Gr. T. Popa Iaşi Centrul Medical Launer Galaţi.

Revista Medico-Chirurgicala a Societatii De Medici Si Naturalisti Din Iasi

|June 1, 2010

Summary

This summary is machine-generated.

Bioelectromagnetism explores how energy fields interact with matter, including living organisms. Historical discoveries led to modern bioresonance devices for medical diagnosis and treatment.

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Published on: July 16, 2020

Area of Science:

Bioelectromagnetism explores the fundamental interactions between energetic fields and matter, with a focus on living systems.

Context:

The study of bioelectromagnetism spans historical discoveries, from J. Bernstein's cell bioelectricity and Wagner's conductivity calculations to F. A. Popp's biophoton theory.
Key developments include the identification of electrical conductivity variations on skin by Hirata and Nakatani, leading to Voll's electrodermal testing system.

Purpose:

To provide an overview of the historical development and fundamental concepts of bioelectromagnetism.
To highlight the evolution of understanding energetic field interactions within biological systems.

Summary:

Bioelectromagnetism encompasses electromagnetosensitive processes and the informational activity of living matter.
Historical milestones include Bernstein's cell bioelectricity, Wagner's conductivity research, biophoton theory, and electrodermal testing.
Practical applications involve medical devices utilizing bioresonance for diagnosis and treatment, supported by clinical studies.

Impact:

Understanding bioelectromagnetism provides insights into the complex energetic and informational dynamics of life.
The historical progression reveals a growing comprehension of biological systems at the energetic level.
Bioresonance-based medical devices represent a significant practical application, aiding in diagnosis and therapeutic interventions.