# Distance and material affects on magnetic full strength

• I
Hi Folks:

This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal?

Dale
Mentor
2020 Award
Hi Folks:

This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal?

It will be almost the same as 1/4 inch of air. See the table here
https://en.m.wikipedia.org/wiki/Permeability_(electromagnetism)

Magnetic force on the metal surface is inversely proportional to the distance. I feel the plywood, a non ferromagnetic material, should not have any
significance to the outcome.

Nidum