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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetic Field Lines01:19

Magnetic Field Lines

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:
Magnetic Field due to Moving Charges01:25

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetostatic Boundary Conditions01:28

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...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Related Experiment Video

Updated: Jul 9, 2026

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Published on: April 4, 2013

Slipping magnetic reconnection in coronal loops.

Guillaume Aulanier1, Leon Golub, Edward E Deluca

  • 1Observatoire de Paris, Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie (UPMC), Université Paris Diderot, 92190 Meudon, France. guillaume.aulanier@obspm.fr

Science (New York, N.Y.)
|December 8, 2007
PubMed
Summary

Solar flares are caused by magnetic reconnection. New evidence suggests a slipping magnetic reconnection process, where field lines slide past each other, is key to understanding solar flares and coronal heating.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Last Updated: Jul 9, 2026

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
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Published on: July 20, 2022

Area of Science:

  • Plasma physics
  • Solar physics
  • Astrophysics

Background:

  • Magnetic reconnection in solar coronal loops drives solar flares and coronal heating.
  • The standard model assumes instantaneous magnetic field line breaking at discontinuous field mappings.
  • An alternative slipping magnetic reconnection mode may occur with continuous but steep field gradients.

Purpose of the Study:

  • To investigate the existence and implications of slipping magnetic reconnection in the Sun's corona.
  • To provide observational support for the slipping magnetic reconnection model.
  • To inform interpretations of magnetic reconnection in solar and laboratory plasmas.

Main Methods:

  • Analysis of soft X-ray observations from the Hinode spacecraft.
  • Observation of fast bidirectional motions of coronal loops.
  • Comparison of observed phenomena with theoretical models of magnetic reconnection.

Main Results:

  • Observed fast bidirectional motions of coronal loops provide evidence for slipping magnetic reconnection.
  • This regime operates where magnetic field mapping is continuous but has steep gradients.
  • Supports an alternative to the standard instantaneous reconnection model.

Conclusions:

  • Slipping magnetic reconnection is a viable process in the solar corona.
  • This mechanism should be considered when studying solar flares and coronal heating.
  • Findings are relevant for both solar and laboratory plasma reconnection studies.