Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.7K
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...
7.7K
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

4.0K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
4.0K
Magnetic Field Lines01:19

Magnetic Field Lines

6.2K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
6.2K
Magnetic Damping01:17

Magnetic Damping

1.2K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.2K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

4.1K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
4.1K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.7K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
6.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Dosimetric Predictors of Problematic Receptive Anal Intercourse After Prostate Radiation Therapy.

Advances in radiation oncology·2026
Same author

In Reply to DeLaney.

International journal of radiation oncology, biology, physics·2026
Same author

Dosimetric Correlates of Acute Toxicities for Moderate Hypofractionated Whole-Breast Irradiation: Implications for ASTRO Planning Guidelines.

Advances in radiation oncology·2026
Same author

Neurogenic thoracic outlet syndrome secondary to an unilateral cervical rib in a poodle mix.

Journal of veterinary internal medicine·2026
Same author

Empirical oral AntibioticS for possible UTI in well appearing Young febrile infants (EASY).

NIHR open research·2026
Same author

Reirradiation Collaborative Group (ReCOG) consensus on standards for dose evaluation and reporting in patients with multiple courses of radiation therapy: an AAPM/ACRO/ASTRO/CARO/COMP/CADRA/CPQR/ESTRO/NRG-endorsed consensus statement.

The Lancet. Oncology·2026
Same journal

Six ways to put the public at the heart of science and policy.

Nature·2026
Same journal

The complex truth about trust in science.

Nature·2026
Same journal

Have people stopped trusting science? The data tell a surprising story.

Nature·2026
Same journal

How FAIR data are helping to build trust in science.

Nature·2026
Same journal

Scientists should recognize their own political biases to build public trust.

Nature·2026
Same journal

Harmonizing standards and resources for the medical genome.

Nature·2026
See all related articles

Related Experiment Video

Updated: Mar 12, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

10.2K

Magnetic reversals from planetary dynamo waves.

Andrey Sheyko1, Christopher C Finlay2, Andrew Jackson1

  • 1Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland.

Nature
|November 8, 2016
PubMed
Summary
This summary is machine-generated.

Earth's magnetic field reversals may stem from a novel dynamo wave process. This new model, operating at low viscosity and high magnetic diffusivity, challenges existing theories and offers insights into geomagnetic polarity changes.

More Related Videos

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

9.7K
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.9K

Related Experiment Videos

Last Updated: Mar 12, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

10.2K
A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

9.7K
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.9K

Area of Science:

  • Geophysics
  • Magnetohydrodynamics
  • Computational fluid dynamics

Background:

  • Earth's magnetic field exhibits polarity reversals, a phenomenon originating from magnetohydrodynamic processes in the core.
  • Existing geodynamo simulations often involve high viscosity and columnar convection, with reversal mechanisms linked to the local Rossby number.

Purpose of the Study:

  • To explore an alternative class of reversing-geodynamo models operating in a low viscosity, high magnetic diffusivity regime.
  • To investigate the mechanism behind geomagnetic polarity reversals beyond the conventional Rossby number paradigm.

Main Methods:

  • Numerical simulations of geodynamo models.
  • Analysis of models operating in a low viscosity and high magnetic diffusivity regime.
  • Examination of the role of east-west flow shear near the inner core boundary.

Main Results:

  • A new class of reversing-geodynamo model was identified, distinct from those dominated by viscosity and columnar convection.
  • Magnetic field stretching by strong east-west flow shear, akin to kinematic dynamo waves, was found crucial for reversals.
  • The model operates in a low viscosity, high magnetic diffusivity regime with geophysically relevant boundary conditions.

Conclusions:

  • The identified dynamo wave mechanism provides a new perspective on geomagnetic polarity reversals.
  • This mechanism, relevant in low viscosity and high magnetic diffusivity conditions, may contribute to observed geomagnetic reversals.