A) remains same
B) becomes 2 L henry
C) becomes 4 L henry
D) becomes\[\frac{L}{\sqrt{2}}\] henry
Correct Answer: C
Solution :
The self-inductance (L) of a coil having N number of t.3ums is given by \[L=\frac{{{\mu }_{0}}{{N}^{2}}A}{l}\] \[\Rightarrow \] \[\frac{{{L}_{1}}}{{{L}_{2}}}=\frac{N_{1}^{2}}{N_{2}^{2}}\] Given, \[{{L}_{1}}=L,\,{{N}_{1}}=N,\,{{N}_{2}}=2N\] \[\therefore \] \[{{L}_{2}}=4L\]
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