Extend Magnetic Field Density from magnetic object's surface?

[Wesleyk89]

I am new to the site I apologize If I am posting incorrectly or doing something wrong. I need help figuring out how to increase magnetic field density (gauss/tesla's) extending from a magnetic object's surface, most magnets magnetic density is all in the center. I need this in order to induce a greater electromotive force on a copper wire. would an object charged by way of friction (rabbit fur on glass rod) have a greater field density but lesser pull force than your standard magnet? also could I take a ring magnet who's field density is concentrated most in the open center and have a copper coil pass through it in the center as opposed to having the magnet pass through the inside of a coil give me a greater EMF? and lastly, can I somehow incorporate an iron core to increase the EMF? maybe have the wire wrapped around a hollow lead core then pass a magnet through its center? and does a copper tube yield the same effect as a copper coil of a similar surface area?

 

[Charles Link]

In general, you can get much braking action between the copper and the permanent magnet, provided the copper is moving relative to the magnet. The copper does not become magnetized, but EMF's from the changing magnetic field that the copper sees cause eddy currents in the copper, and these eddy currents experience forces from the magnetic field of the magnet that slow the motion of the copper.

 

[berkeman]

Welcome to the PF.

I need help figuring out how to increase magnetic field density (gauss/tesla's) extending from a magnetic object's surface,

The main way you can concentrate magnetic field lines is by being careful about containing them in a ferrous material (shielding, cores, etc.).

Your post is general enough and variable enough that I'm not able to offer much yet. Can you say more about the application? And maybe Upload a sketch of what you are trying to build? That would help a lot in focusing this discussion. Thanks very much.

 

[davenn]

I need help figuring out how to increase magnetic field density (gauss/tesla's) extending from a magnetic object's surface, most magnets magnetic density is all in the centre

get a stronger magnet ... rare Earth types

would an object charged by way of friction (rabbit fur on glass rod) have a greater field density but lesser pull force than your standard magnet?

for something like that ... a static charge, there is only an electric field, ie. zero magnetic field