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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.4K
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...
7.4K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.9K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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Magnetic Field Lines01:19

Magnetic Field Lines

5.8K
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:
5.8K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.8K
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...
2.8K
Classifying Matter by Composition03:35

Classifying Matter by Composition

90.7K
Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or...
90.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.4K
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.
6.4K

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Related Experiment Video

Updated: Feb 8, 2026

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
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Cosmological Magnetic Fields from Ultralight Dark Matter.

Robert Brandenberger1, Jürg Fröhlich2, Hao Jiao1,3

  • 1McGill University, Department of Physics, Montréal, Quebec H3A 2T8, Canada.

Physical Review Letters
|February 6, 2026
PubMed
Summary

A new mechanism explains the origin of large-scale magnetic fields after the early universe

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Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • The origin of cosmological magnetic fields remains a significant unsolved problem in astrophysics.
  • Existing theories struggle to explain the observed magnetic field strengths on large scales.

Purpose of the Study:

  • To propose a novel mechanism for generating magnetic fields on cosmological scales.
  • To investigate the role of dark matter interactions in early universe magnetogenesis.

Main Methods:

  • Utilizing axion electrodynamics with a pseudoscalar dark matter field (ϕ).
  • Analyzing the parametric resonance instability of the electromagnetic field.
  • Incorporating the ϕF∧F coupling term in the Lagrangian.

Main Results:

  • Demonstrated a mechanism for generating magnetic fields after cosmological recombination.
  • Magnetic fields exceeding observational lower bounds can be produced.
  • Generation occurs on astrophysically relevant scales (approximately 1 Mpc).

Conclusions:

  • The proposed mechanism offers a viable explanation for large-scale magnetic fields.
  • Axion-like dark matter provides a potential source for early universe magnetogenesis.
  • The model predicts observable magnetic field strengths shortly after recombination.