Force between two magnets as related to distance

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Homework Help Overview

The discussion revolves around deriving an equation for the attractive or repulsive force between two magnets as a function of the distance separating them. The original poster expresses a specific interest in achieving a condition where the force is effectively zero, indicating no interference between the magnets.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster considers using Newton's Universal Gravity equation and manipulating the pull force of the magnets to derive a mass. They also mention setting the force to an infinitely small amount to solve for distance. Some participants question the interpretation of the problem, particularly regarding the balance of gravitational attraction and magnetic repulsion, and the relevance of gravitational acceleration in this context.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the formula for the force between bar magnets, but there is no explicit consensus on the approach to take.

Contextual Notes

There is a mention of the need for the magnets to not visibly affect each other, which raises questions about the assumptions regarding their interactions and the conditions under which they are analyzed.

Magnet4less
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Hello,
I am new to the forum, thus please be patient with me.

I have a little bit of a problem...

Currently working with magnets. Basically, I need to derive an equation for the attractive/repulsive force between two magnets given a distance between them. The most important thing is that these magnets not interfere with each other, in other words I need the attractive/repulsive force to be zero.

Thoughts so far...
- Newton's Universal Gravity equation
- F = GMm/R²
- manipulate the pull force of the magnet to derive a mass...divide pull force of magnet by 9.8m/s^2
- need to set F to an infinitely small amount and solve for R

I do not get offended very easily, so if you need to completely slam my thoughts so far in order to get me on the right track, I understand.

Thank you in advance for your help
 
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Welcome to PF!

Magnet4less said:
Basically, I need to derive an equation for the attractive/repulsive force between two magnets given a distance between them.
The most important thing is that these magnets not interfere with each other, in other words I need the attractive/repulsive force to be zero.

Hi Magnet4less ! Welcome to PF! :smile:

I'm not sure what you mean … do you mean you want the gravitational attraction between the magnets to be balanced by their magnetic repulsion? :confused:

(but if so, why are you using the value of g here on Earth?)
 
I'm trying to figure out how close I can place the magnets to one another without them visibly affecting each other.
 

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