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## Main Question or Discussion Point

Dear all,

1) For a spherical permanent magnet, the magnetization M is defined to be pi/4u0*Br*d^3. My question is: if I attach 4 such spherical magnets together, would the magnetization simply be 4M? Where (website) can I find a good reference for these type of material?

2) I have read in an article, "Magnet levitation at your fingertips" (please google) that for a setup with a solenoid creating a magnetic field, B that B/B' can be approximated by R (for short solenoid) and 1.2 R (for long solenoid). However, I can not find any articles or books that support this claim. How did the author came up with that?

Thanks,

Mike

1) For a spherical permanent magnet, the magnetization M is defined to be pi/4u0*Br*d^3. My question is: if I attach 4 such spherical magnets together, would the magnetization simply be 4M? Where (website) can I find a good reference for these type of material?

2) I have read in an article, "Magnet levitation at your fingertips" (please google) that for a setup with a solenoid creating a magnetic field, B that B/B' can be approximated by R (for short solenoid) and 1.2 R (for long solenoid). However, I can not find any articles or books that support this claim. How did the author came up with that?

Thanks,

Mike