$A$ solenoid with an air core has length $48 \pi \ cm$,area of cross section $12 \ cm^2$ and $1200$ turns. The self-inductance of the solenoid is: (in $mH$)

  • A
    $4.6$
  • B
    $6.9$
  • C
    $1.44$
  • D
    $9.2$

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