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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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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.
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Magnetic Damping01:17

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Magnetic Force On Current-Carrying Wires: Example01:22

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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.
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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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Updated: Sep 1, 2025

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
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Wireless Miniature Magnetic Phase-Change Soft Actuators.

Yichao Tang1,2, Mingtong Li2,3, Tianlu Wang2,4

  • 1School of Mechanical Engineering, Tongji University, Shanghai, 201804, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 17, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a miniature magnetic phase-change soft actuator with significantly enhanced force and work capacity. This advancement promises to improve wireless soft robots for medical and other applications.

Keywords:
high work capacitymagnetic soft compositesminiature wireless soft devicesphase-change materialsprogrammable shape deformation

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Area of Science:

  • Materials Science
  • Robotics
  • Biomedical Engineering

Background:

  • Miniature soft actuators are limited by low output force and work capacity.
  • Existing magnetic soft actuators lack sufficient power for demanding applications.

Purpose of the Study:

  • To develop a miniature magnetic phase-change soft composite actuator with enhanced mechanical output.
  • To demonstrate the actuator's versatility in medical and robotic applications.

Main Methods:

  • Fabrication of a magnetic phase-change soft composite actuator.
  • Utilizing remote magnetic radio frequency heating for actuation.
  • Integration with shape-memory polymers and metamaterials for advanced devices.

Main Results:

  • Achieved up to 70 N output force and 175.2 J g⁻¹ work capacity, a 10⁶–10⁷ fold increase over traditional actuators.
  • Demonstrated a wireless soft robotic device capable of withstanding high fluid flow.
  • Developed a wireless reversible bistable stent for potential angioplasty applications.
  • Showcased locomotion in granular media and programmable bending deformations.

Conclusions:

  • The miniature magnetic phase-change soft actuator significantly enhances the performance of soft robotic systems.
  • This technology offers a versatile platform for advanced medical devices, including stents, and other applications.
  • The developed actuator overcomes previous limitations, paving the way for more powerful and adaptable soft robots.