Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


magnetite powder tip - magnetic force?

magnetite powder tip - magnetic force?

magnetite powder tip - magnetic force?


I am designing a solenoid to interact with a magnetite-powder tip. I can't find specifications about the magnetite I am using, and properties seem to depend on factors I don't know. Could you give me a rough estimate (just order of magnitude is fine) of the force given a certain magnetic field B of the solenoid and a tip of area pi*(0.2mm)^2 covered in magnetite powder?

Thank you

RE: magnetite powder tip - magnetic force?

since the permeability of magnetite is hundreds (if not thousands) of times higher than air, you can treat it as steel. in this case, the pulling force F = .577 x B^2 x S
B- the flux density at the magnetite tip (not the B inside the solnoid which should be larger than B at a distance to the tip), unit: KG
S-area of tip in square inch
F - force in lb
Assuming B = 5kG, F = .577 x 5x5 x 3.14 (.2/25.4)^2 = .0028 lb
assuming B = 10 KG, F=.011 lb.

You can see the challenge is to get the B which is closely related to the gap between the tip and solenoid.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close