A wire of fixed lengths is wound on a solenoid of length $\mathcal{l}$ and radius r. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length $\mathcal{l}/2$ and radius r/2, then the self inductance will be –

1.  $2\mathrm{L}$

2.  $\mathrm{L}$

3.  $4\mathrm{L}$

4.  $8\mathrm{L}$

Concept Videos :-

#12 | Self Induction
#13 | Self Induction & Energy Stored in Inductor

Concept Questions :-

Self-inductance

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