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A wire of fixed length is wound on a sol...

A wire of fixed length is wound on a solenoid of length l and radius r, its self inductance is found to be L. If same wire is wound on a solenoid of length `l/3` and radius `r/3`, then self inductance will be

A

`2L`

B

`3L`

C

`L/2`

D

`L/3`

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