Related Experiment Video
Updated: Oct 19, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
Published on: January 16, 2021
A Proposed Coil System for the Improved Realization of the Absolute Ampere
P T Olsen1, W D Phillips1, E R Williams1
1National Bureau of Standards, Washington, D.C. 20234.
Abstract:
In order to resolve the discrepancies which presently exist between the directly measured values of the absolute or SI ampere and the calculated values obtained indirectly from other fundamental physical constant determinations, one must design an absolute ampere experiment which will produce a result with an uncertainty of one half part per million or less. A new approach recently proposed by Kibble promises such sub-ppm accuracy. Presented here is the design and evaluation of a coil system which will fulfill the requirements of this new approach.
More Related Videos
05:26Author Spotlight: Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo
Published on: May 26, 2023
13:29Electric and Magnetic Field Devices for Stimulation of Biological Tissues
Published on: May 15, 2021
Related Concept Videos
Ampere's Law
Ampère's law states that for any...
The Ideal Transformer
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's...
Torque On A Current Loop In A Magnetic Field
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 Field Of A Current Loop
Mutual Inductance
When two circuits carrying time-varying currents are close to one another, the magnetic flux through each circuit varies because of the changing current in the other circuit. Consequently, an emf is induced in each circuit by the changing current in the other. Therefore, this type of emf is called...
Ampere's Law: Problem-Solving
Specific steps need to be considered while calculating the symmetric magnetic field distribution...