\(\mathrm{L}=(3 \mathrm{a}) \mathrm{N} \quad(\mathrm{N}=\text { total tums })\)
And length of winding \(=(d) N=\ell\)
\((d=\text { diameter of wire })\)
Self inductance \(=\mu_{0} \mathrm{n}^{2} \mathrm{A} \ell\)
\(=\mu_{0} n^{2}\left(\frac{\sqrt{3} a^{2}}{4}\right) d N\)
\(\alpha a^{2} N \propto a\)
So self inductance will become \(3\) times.
તારની અવરોધકતા $1.23 \times 10^{-8}\, \Omega m$ છે.
(${e}^{-1}=0.37$ લો)