Magnet length and changes in guitar pickup properties

Hi,

This is my first post and I don't know much about electronics, but I'm in the process of making guitar (well, bass actually) pickups and learning as much as I can. So, to my question...

How does the magnet length affect the pickup properties, where the only difference is that all the magnets protrude below the bottom flatwork (ie. the coil core is 6.2mm, leaving more than half the magnet exposed. See examples below)? Keep in mind that I'm not referring to raising or lowering magnets (eg. stagger in strat pickups).

For example, what is the difference in the pickup properties of example

1 and 2 below if they both have exactly the same dimensions except those listed (both examples use alnico 5 magnets with a diameter of 9.5mm):

Ex 1

- Magnet length 28mm

- Wire covers 6.2mm from the top part of the magnet only. Magnet exposed by say 1mm at the top flatwork and 20.8mm exposed beneath the coil

Ex 2

- Magnet length 16mm

- Wire covers 6.2mm from the top part of the magnet only. Magnet exposed by say 1mm at the top flatwork and 8.8mm exposed beneath the coil

Regards, Michael

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MK
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