Excerpt from The Self-Inductance of a Coil of Any Length Wound With Any Number of Layers of Wire
This is 1 part in 900 more than the value obtained above (20) by the more accurate method, showing that Stefan's formula is not seriously in error for a coil whose length is equal... to its radius, but it is much less accurate than for short coils, as its method of deriva tion requires.
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