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

1.  2L                     

2.  L 

3.  4L                     

4.  8L

Concept Videos :-

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

Concept Questions :-

Self-inductance

1.    L=μ0N2πr2l        Length of wire=N 2πr=constant=C, suppose           L=μ0C2πr2πr2l                     L1l          Self inductance will become 2L.

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