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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

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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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Eddy Currents01:25

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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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,...
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Magnetic Field Due to Two Straight Wires01:18

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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 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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Magnetism01:30

Magnetism

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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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Related Experiment Video

Updated: Aug 13, 2025

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
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Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis

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Low Cost Magnetic Field Control for Disabled People.

Daniel Acosta1, Bibiana Fariña1, Jonay Toledo1

  • 1Computer Science and Systems Department, Universidad de La Laguna, 38200 San Cristobal de La Laguna, Spain.

Sensors (Basel, Switzerland)
|January 21, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces an affordable electric wheelchair navigation system using tongue movements as a human-machine interface (HMI). This innovative tongue-controlled wheelchair offers enhanced mobility and computer access for individuals with disabilities.

Keywords:
handicappedintelligent wheelchairrobotics

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Engineering
  • Human-Computer Interaction

Background:

  • Electric wheelchairs are crucial for mobility but often lack intuitive control for severely disabled individuals.
  • Existing human-machine interfaces (HMIs) can be expensive or require significant motor control.
  • There is a need for cost-effective and accessible control systems for electric wheelchairs.

Purpose of the Study:

  • To develop and evaluate a low-cost, tongue-controlled navigation system for electric wheelchairs.
  • To provide an alternative HMI for disabled individuals with limited limb mobility.
  • To assess the feasibility of using tongue movements for real-time wheelchair control.

Main Methods:

  • A novel HMI system utilizing a neodymium magnet on the tongue and a suction pad.
  • Integration of low-cost electronics, including two electronic compasses for magnet positioning.
  • Real-time data processing via a microcontroller with a computational algorithm based on magnetic field formulations.
  • Testing the system's effectiveness in controlling an electric wheelchair using real-world data.

Main Results:

  • The system successfully detected tongue position using magnetic field sensing.
  • A trained user demonstrated effective control of an electric wheelchair through tongue movements.
  • The cost-effective design makes the system potentially accessible for a wider range of users.
  • The system proved capable of controlling both electric wheelchairs and computers.

Conclusions:

  • Tongue movement is a viable and effective HMI for controlling electric wheelchairs and computers.
  • The developed system offers a cost-effective solution for enhancing mobility and independence in disabled individuals.
  • This technology has the potential to significantly improve the quality of life for people with severe motor impairments.