Richard Clark wrote:
Asked: At one length, one coil exhibits
Vf = 0.02,
reduce the coil length, what length for the SAME coil would that be
to render
Vf = 0.2
for instance?

"Richard Clark" wrote:
Pitch for any coil remains the same irrespective of its
length. Frequency does not change, diameter does not change; it then
follows that Vf does not change when a coil is shortened.

Doesn't your own posting answer your question?
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73, Cecil http://www.qsl.net/w5dxp