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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

749
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 Force01:18

Magnetic Force

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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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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...
3.7K
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.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
5.1K
Motional Emf01:22

Motional Emf

3.6K
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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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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Related Experiment Video

Updated: Nov 8, 2025

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli
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Magnetic matchstick micromotors with switchable motion modes.

Xiaoliang Zhang1, Wenqing Xie, Huaguang Wang

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China. hgwang@suda.edu.cn zhangzx@suda.edu.cn.

Chemical Communications (Cambridge, England)
|April 20, 2021
PubMed
Summary

Researchers developed magnetic matchstick micromotors with switchable motion. These tiny machines can rotate or move straight, controlled by magnetic fields, enabling new microscale sensing applications.

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Area of Science:

  • * Micro-robotics and Nanotechnology
  • * Materials Science and Engineering
  • * Chemical Engineering

Background:

  • * Precise control over micromotor motion is essential for micro-environment applications.
  • * Existing micromotors often lack the ability to switch motion modes in situ.
  • * Complex microenvironments require adaptable micro-scale tools.

Purpose of the Study:

  • * To design and synthesize magnetic micromotors capable of multiple motion modes.
  • * To achieve in situ and reversible switching between rotational and linear motion.
  • * To explore the potential of these switchable micromotors for sensing and probing.

Main Methods:

  • * Synthesis of novel magnetic matchstick micromotors.
  • * Application of external magnetic fields to control motion.
  • * In situ observation and characterization of micromotor behavior.

Main Results:

  • * Successfully created magnetic matchstick micromotors.
  • * Demonstrated two distinct motion modes: persistent rotation and straight-line movement.
  • * Achieved facile and reversible switching between motion modes using magnetic fields.

Conclusions:

  • * Developed micromotors with switchable motion capabilities.
  • * Magnetic field control enables versatile locomotion for micro-robots.
  • * These micromotors show significant promise for microscale sensing and probing applications.