How do you calculate the Force of Attraction of two magnets?

  • Thread starter ryccoh
  • Start date
  • #1
ryccoh
I just took physics 2. We learned how to calculate the force of a magnetic field on a current or moving charges. What we didn't learn is how to calculate the force of attraction of two bar magnets or electromagnets for that matter. I'm building a coilgun and having a set of equations for this would come in really handy.
 

Answers and Replies

  • #2
DrDu
Science Advisor
6,200
859
You could imagine the bar magnet to be made up of small magnetic dipoles, i.e. the magnetization M is the dipole moment density. So you could derive first the magnetic moment of a dipole and the force it experiences in a homogeneous magnetic field (e.g. you can model it as an arbitrary small current loop) and then you can obtain the force between extended magnets integrating over the magnetizations.
 

Related Threads on How do you calculate the Force of Attraction of two magnets?

  • Last Post
Replies
6
Views
7K
Replies
9
Views
1K
  • Last Post
Replies
6
Views
20K
Replies
14
Views
1K
Replies
9
Views
8K
Replies
1
Views
5K
Replies
38
Views
8K
Replies
1
Views
3K
Top