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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.1K
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...
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Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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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.
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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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...
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Remote Magnetic Actuation of Micrometric Probes for in situ 3D Mapping of Bacterial Biofilm Physical Properties
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Capillary assemblies in a rotating magnetic field.

Galien Grosjean1, Maxime Hubert2, Ylona Collard1

  • 1GRASP Lab, CESAM Research Unit, University of Liège, B-4000 Liège, Belgium. ga.grosjean@uliege.be.

Soft Matter
|October 30, 2019
PubMed
Summary
This summary is machine-generated.

Metallic spheres assemble on fluids via magnetic fields and can self-propel. This study explores how rotating magnetic fields influence these structures, revealing diverse rotational behaviors and underlying mechanisms for new applications.

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Area of Science:

  • Soft Matter Physics
  • Micro-robotics
  • Materials Science

Background:

  • Capillary forces cause small objects on fluids to aggregate.
  • Magnetic fields enable assembly of submillimeter metallic spheres into tunable structures.
  • Time-varying fields induce self-propulsion in these assemblies via broken time-reversal symmetry.

Purpose of the Study:

  • To investigate the effect of in-plane magnetic field rotation on self-assembling metallic sphere structures.
  • To identify and understand the various rotational modes and their underlying mechanisms.
  • To explore the role of symmetry and field parameters in assembly dynamics.

Main Methods:

  • Experimental observation of submillimeter metallic sphere assemblies under rotating magnetic fields.
  • Analysis of individual particle rotation due to magnetic properties.
  • Investigation of dipole-dipole interactions influencing assembly alignment.
  • Study of non-reciprocal deformations enabling assembly rotation.

Main Results:

  • Observed diverse rotational modes in metallic sphere assemblies under rotating magnetic fields.
  • Identified individual particle rotation, whole-assembly alignment via dipole interactions, and deformation-powered rotation.
  • Demonstrated the significant influence of symmetry, field frequency, and amplitude on assembly dynamics.

Conclusions:

  • The rotation of magnetic fields introduces complex dynamics to self-assembled structures.
  • Understanding these dynamics is crucial for explaining prior observations and developing novel functionalities.
  • This research paves the way for designing advanced micro-machines and controlled material assembly.