# Is the strength of the magnetic field the same across the surface of the magnet's pole?

Consider the following configuration:

Will the two blocks of iron (in the image) experience the same magnetic pull (one being in the center and the other closer to the edge of the pole's top surface)?

Are the magnetic field "lines" evenly distributed across the pole?

• I think the more number of magnetic field lines the stronger the force but that's my naive thinking hee hee. – user6760 Dec 16 '18 at 6:47
• This question is the subject of a meta discussion. – rob Dec 27 '18 at 5:33

As a rule of thumb, if you want your magnetic field to be uniform over some length scale $$\Delta x$$, then the distance between your should-be-uniform field region and you magnetic field source should be several times larger than $$\Delta x$$. There is a nice mathematical technique for estimating just how much larger.