What is permanent magnet B field equation?

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Homework Help Overview

The discussion revolves around finding an equation to calculate the magnetic field (B field) between two permanent magnets positioned 10mm apart, with specific intensities at their cores and surfaces. The original poster seeks a formula to determine the magnetic field strength at a distance of 5mm from each magnet.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between the magnetic field of the magnets and the electric field of a uniformly charged disk, suggesting a potential analogy. The original poster seeks a specific formula for calculating the magnetic field intensity based on various parameters.

Discussion Status

Some participants have provided insights into the relationship between the magnetic and electric fields, while the original poster continues to seek a clear formula for their specific scenario. The discussion reflects a mix of theoretical exploration and practical application without reaching a consensus on a definitive solution.

Contextual Notes

The original poster has specified parameters such as the dimensions of the magnets and their magnetic intensities, indicating a structured approach to the problem. However, the exact formula or method for calculation remains undetermined.

ShahinPhD
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I'm looking for an equation to calculate Tesla (B) between two permanent magnets with distance of 10mm.

Magnets are located in front of each other; disk shape and intensity of each is 1.3T in its core, and 0.6T on surface, so I'm interested how to calculate the B between them in distance of 5mm from each one (10mm between 2 magnets).

Please help me to find proper calculation.
Thanks in advanced.
 
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If the magnets are much longer than 5mm, the B field 5mm from the face of one magnet is the same as the E field 5mm from a uniformly charged disk with charge density
\sigma=M where M=13,000 gauss (all in Gaussianl units). Just double it for two magnets.
 
Thanks for your fast response.
It seems OK, but in a short form I'm looking for a formula to calculate the Tesla in distance between two magnets.
Suppose we have some parameters: dimensions of magnets, power of magnets in core and surface, distance between them; so how can we use a formula to calculate intensity between magnets in some distance?

(Frankly I'm looking for a formula to use for my calculations)
 

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The on axis formula for E due to a uniformly charged disk is in most (even elementary) textbooks.
 

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