If a coil has diameter 'd', number of turns 'N' and form factor 'F' then the inductance of the coil is proportional to
A. \[{{\text{N}}^2}{\text{dF}}\]
B. \[{\text{N}}{{\text{d}}^2}{\text{F}}\]
C. \[\frac{{{{\text{N}}^2}{{\text{d}}^2}}}{{\text{F}}}\]
D. \[\frac{{{{\text{N}}^2}{\text{d}}}}{{\text{F}}}\]
Answer: Option C

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