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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 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.
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 Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Motional Emf01:22

Motional Emf

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 magnetic...

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Related Experiment Video

Updated: Jul 1, 2026

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
09:14

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

Published on: December 7, 2017

Pulse-loaded ferroelectric nanowire as an alternating current source.

Yue Zheng1, C H Woo, B Wang

  • 1Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China.

Nano Letters
|September 11, 2008
PubMed
Summary

Simulations show that ferroelectric nanowires can generate usable alternating current voltage when subjected to specific pulse loading. This finding supports their use in nanomechanical sensors and energy harvesting applications.

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Last Updated: Jul 1, 2026

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ferroelectric materials exhibit spontaneous electric polarization.
  • Nanowires offer unique properties due to their high surface-area-to-volume ratio.
  • Energy harvesting and nanomechanical sensing are key areas of research.

Purpose of the Study:

  • To simulate the behavior of uniaxially pulse-loaded ferroelectric nanowires.
  • To investigate the potential of these nanowires as nanopower sources or nanomechanical sensors.

Main Methods:

  • Utilized a Landau-Ginzburg type thermodynamic model for simulations.
  • Analyzed the response of ferroelectric nanowires under uniaxial pulse loading.

Main Results:

  • Ferroelectric nanowires can produce sizable alternating current voltage under specific load conditions.
  • The generated voltage is sufficient for practical applications.

Conclusions:

  • Optimized ferroelectric nanowires can serve as effective nanopower sources for energy harvesting.
  • These nanowires demonstrate potential as sensitive nanomechanical sensors.