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Related Concept Videos

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 Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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...
Magnetic Damping01:17

Magnetic Damping

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...
Open and closed-loop control systems01:17

Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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Related Experiment Video

Updated: Jun 14, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Closed-loop control of magnetic fluid deformable mirrors.

Azhar Iqbal1, Zhizheng Wu, Foued Ben Amara

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada.

Optics Express
|April 8, 2010
PubMed
Summary

This study evaluates a novel closed-loop adaptive optics system using a magnetic fluid deformable mirror (MFDM) for clearer ophthalmic imaging. The developed control method effectively corrects eye aberrations, improving retinal image quality.

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Last Updated: Jun 14, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
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Published on: August 28, 2017

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
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Published on: April 4, 2013

Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Control Systems

Background:

  • Adaptive optics systems correct optical aberrations for improved imaging.
  • Magnetic fluid deformable mirrors (MFDMs) offer a new approach to wavefront correction.
  • Ophthalmic imaging benefits from aberration correction to enhance retinal image clarity.

Purpose of the Study:

  • To experimentally evaluate a closed-loop adaptive optics system incorporating an MFDM.
  • To present and validate a novel control method for MFDM surface shape linearization.
  • To demonstrate the system's efficacy in correcting ocular aberrations.

Main Methods:

  • Development of a control strategy based on a DC-decoupled model of the multi-input multi-output system.
  • Implementation of a decentralized proportional-integral (PI) controller.
  • Experimental testing of a closed-loop system with a 19-channel prototype MFDM.

Main Results:

  • Successful experimental evaluation of the closed-loop adaptive optics system.
  • Demonstration of the effectiveness of the MFDM surface shape linearization technique.
  • Validation of the controller's performance in correcting optical aberrations.

Conclusions:

  • The presented control method enables effective operation of MFDM-based adaptive optics systems.
  • This technology holds significant potential for enhancing clinical ophthalmic imaging.
  • The closed-loop system demonstrates practical feasibility for aberration correction.