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Related Concept Videos

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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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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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...
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Ferromagnetism01:31

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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.
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Related Experiment Video

Updated: Nov 18, 2025

An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components
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Light-Driven Magnetic Encoding for Hybrid Magnetic Micromachines.

Huan Wang1,2, Bin-Bin Xu1, Yong-Lai Zhang1

  • 1State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.

Nano Letters
|February 8, 2021
PubMed
Summary

A novel optical printing technique enables magnetic encoding on diverse materials, overcoming limitations of traditional magnetic manipulation. This method facilitates precise control of microstructures for applications like microbots and microsurgery.

Keywords:
Magnetic manipulationMicrobubblesMicromachinesOptical printing

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Area of Science:

  • Microfluidics and Nanotechnology
  • Optical Engineering
  • Biomedical Engineering

Background:

  • Magnetic manipulation of micromachines is crucial but limited to ferromagnetic or superparamagnetic materials.
  • Existing methods restrict the applicability of magnetic control in microscale applications.

Purpose of the Study:

  • To introduce a versatile optical printing technique for on-demand magnetic encoding on arbitrary materials.
  • To overcome the material limitations of conventional magnetic manipulation methods.

Main Methods:

  • Femtosecond laser-directed bubble microprinting (FsLDBM) utilizes Marangoni convection, evaporation flow, and capillary force.
  • Nanomaterials are printed onto solid-state substrates, enabling magnetic encoding.
  • Proof-of-concept demonstrated magnetic actuation of a microturbine and manipulation of a living daphnia.

Main Results:

  • FsLDBM successfully printed nanomagnets onto a 3D polymer microturbine, enabling magnetic actuation.
  • Magnetic encoding and versatile manipulation were achieved on a living daphnia.
  • The technique demonstrated applicability on arbitrary solid-state substrates.

Conclusions:

  • FsLDBM provides a versatile platform for magnetic encoding and manipulation of microstructures.
  • This approach expands the possibilities for magnetic control in micro-robotics and biological applications.
  • The technique holds promise for developing smart microbots and advancing biological microsurgery.