Need info about 11" coil

[solmer]

Hi again,  I'm planning of building a 11 inch coil using CAT 5 cable. I need to know how many turns should I use. I know that for 40cm coil I should use 3 turns (3x8=24 turns) and wonder how many for a 11" (inch) coil.

Any help would be appreciated.

Thanks in advance.

Best regards.
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