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Related Concept Videos

Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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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Related Experiment Video

Updated: Jun 17, 2026

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Cell guidance by magnetic nanowires.

Fredrik Johansson1, Malin Jonsson, Kersti Alm

  • 1Department of Cell and Organism Biology, Lund University, Helgonavägen 3b, SE-22362 Lund, Sweden. per_fredrik.johansson@cob.lu.se

Experimental Cell Research
|December 29, 2009
PubMed
Summary

Magnetic nickel nanowires guide cell growth, offering a novel approach for tissue engineering and lab-on-a-chip applications. These aligned nanowires demonstrate contact guidance for fibroblasts and neurons without apparent toxicity.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Nanotechnology

Background:

  • Contact guidance, the influence of surface topography on cell alignment, has been observed since the early 20th century.
  • Previous studies focused on structured surfaces and fibers to direct cell behavior.
  • A new method utilizing magnetic nanowires is introduced to induce cell guidance.

Purpose of the Study:

  • To investigate the potential of magnetic nickel nanowires for inducing contact guidance in cells.
  • To evaluate the biocompatibility of nickel nanowires for cell culture.
  • To explore applications in lab-on-a-chip devices and nerve regeneration.

Main Methods:

  • Magnetic nickel nanowires (200 nm diameter, 40 µm length) were fabricated using template-based electro-deposition.
  • Nanowires were suspended in ethanol, applied to glass coverslips, aligned using an external magnetic field, and adhered upon ethanol evaporation.
  • L929 fibroblasts and dorsal root ganglia (DRG) neurons were cultured on the aligned nanowire substrates for 24 and 72 hours, respectively.

Main Results:

  • Aligned nickel nanowires successfully induced contact guidance in L929 fibroblasts.
  • Regenerated axons from DRG neurons also exhibited contact guidance along the aligned nanowires.
  • No significant toxicity was observed in cells cultured on the nickel nanowires.

Conclusions:

  • Aligned magnetic nickel nanowires provide an effective method for directing cell and axon growth.
  • This technique shows promise for developing advanced lab-on-a-chip systems.
  • Nickel nanowires represent a viable material for future medical nerve grafts and regenerative therapies.