Find magnetic field from temporary magnet

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Discussion Overview

The discussion revolves around determining the magnetic field strength of a temporary magnet and the force between a magnet and a piece of iron. Participants explore the complexities involved in calculating these values, particularly focusing on the magnetic field generated by the iron in response to the magnet.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks a formula for calculating the magnetic field strength of a temporary magnet and the force between it and a piece of iron, referencing a specific equation involving magnetic permeability and field strengths.
  • Another participant notes the complexity of the problem and suggests that a rough approximation can be made by assuming the second magnet produces a magnetic field as strong as the field at its location without the magnet.
  • A follow-up inquiry asks for methods to approximate or find the magnetic field strength at a specific point.
  • A different participant proposes that if the distance is sufficiently large, the magnet can be approximated as a dipole, recommending the use of dipole formulas for calculations.

Areas of Agreement / Disagreement

Participants express varying degrees of uncertainty regarding the calculations and approximations needed, indicating that the discussion remains unresolved with multiple competing views on how to approach the problem.

Contextual Notes

Limitations include the assumptions made about distances and the nature of the magnetic fields involved, as well as the potential need for further clarification on the definitions of terms used in the equations.

SirHall
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What I've not been able to find after literally spending several hours researching is if you can find the formula to find the magnetic field strength from a temporary magnet. Or, to be put in better terms, what would be the force between two objects if one is a magnet and the other is something like a piece of iron? I've found ##F=\frac{KBH}{d^2}##
Where:
F = Magnetic Force
K = Magnetic Permeability
B = Magnetic Field
H = Second Magnetic Field

What I haven't been able to find however is how to find the magnetic field of 'H', or the magnetic field of the 'iron'.
Thanks for answers
 
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It is complicated. To get some rough approximation, you can assume that the second magnet will produce a magnetic field as strong as the field at its place without the magnet.
 
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mfb said:
It is complicated. To get some rough approximation, you can assume that the second magnet will produce a magnetic field as strong as the field at its place without the magnet.
Thanks, and if it's not too much to ask, would there be a way to approximate or find that?
 
Approximate what, the field from the magnet at that point? If the distance is large enough, you can approximate your magnet as a dipole and use the formula for dipoles.
 

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