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Induction01:16

Induction

5.7K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
5.7K
Self-Inductance01:24

Self-Inductance

3.1K
Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would...
3.1K
Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

5.6K
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
5.6K
Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

5.0K
The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
5.0K
Reaction Mechanisms03:06

Reaction Mechanisms

31.0K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
31.0K
Electric Potential Energy in a Uniform Electric Field01:09

Electric Potential Energy in a Uniform Electric Field

6.5K
When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
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Related Experiment Video

Updated: Feb 8, 2026

Author Spotlight: Studying Biomechanics of Circulating Cells by Modulating Their Electrodeformation Behavior
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Author Spotlight: Studying Biomechanics of Circulating Cells by Modulating Their Electrodeformation Behavior

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A mechanically based magneto-inductive transmitter with electrically modulated reluctance.

Nathan Strachen1, John Booske1, Nader Behdad1

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.

Plos One
|June 29, 2018
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Summary

This study introduces a novel magneto-inductive (MI) transmitter using a rotating magnet for efficient underwater and underground wireless communication. This new design offers improved efficiency and bandwidth over traditional methods.

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Area of Science:

  • Wireless Communication
  • Electromagnetism
  • Materials Science

Background:

  • Magneto-inductive (MI) communication is suitable for challenging environments like underwater and underground.
  • Conventional MI transmitters often use coils or solenoids, which have limitations.

Purpose of the Study:

  • To present a new design for an MI transmitter utilizing a rotating permanent magnet.
  • To introduce and verify a novel amplitude modulation technique for MI communication.

Main Methods:

  • A new MI transmitter design employing a rotating permanent magnet was developed.
  • A modulation technique was implemented by electrically altering the permeability of a surrounding shield.
  • Experimental verification of the proposed design and modulation technique was performed.

Main Results:

  • The rotating magnet design demonstrates feasibility and advantages over conventional MI transmitters.
  • The developed modulation technique effectively modulates the magnetic fields without altering rotational speed.
  • The new approach shows potential for increased efficiency and bandwidth.

Conclusions:

  • The rotating magnet MI transmitter offers a promising alternative for wireless communication in restricted environments.
  • The electrical permeability modulation technique provides an efficient method for MI signal modulation.
  • This research contributes to advancing MI communication technology for enhanced performance.