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Related Concept Videos

Magnetic Fields01:28

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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.
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.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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.
Magnetic Field due to Moving Charges01:25

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Related Experiment Video

Updated: Jul 15, 2026

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Simple phase method for measurement of magnetic field gradient waveforms.

Peter Latta1, Marco L H Gruwel, Vyacheslav Volotovskyy

  • 1Institute for Biodiagnostics, National Research Council of Canada, Winnipeg, Manitoba, Canada. peter.latta@nrc-cnrc.gc.ca

Magnetic Resonance Imaging
|April 10, 2007
PubMed
Summary

This study introduces a simple magnetic resonance (MR) method to precisely measure magnetic field gradient waveforms in MR scanners. The technique accurately assesses gradient behavior, crucial for advanced fast MRI techniques.

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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

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Related Experiment Videos

Last Updated: Jul 15, 2026

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
08:32

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

Published on: May 7, 2017

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Physics

Background:

  • Magnetic field gradients are essential for Magnetic Resonance Imaging (MRI) and spectroscopy.
  • Fast MRI techniques demand increasingly precise gradient switching for optimal performance.

Purpose of the Study:

  • To present a straightforward MR method for characterizing magnetic field gradient waveforms.
  • To evaluate the accuracy and applicability of this method for quality control in MRI.

Main Methods:

  • Utilizes slice excitation followed by gradient application and Free Induction Decay (FID) acquisition.
  • Employs a spherical phantom filled with doped water at the scanner's isocenter.

Main Results:

  • Successfully measured various magnetic field gradient waveforms.
  • Achieved an estimated measurement error of less than 200 microT/m.

Conclusions:

  • The developed MR method is a simple yet effective tool for assessing gradient waveform behavior.
  • This technique can aid in ensuring the quality and precision of fast MRI experiments.