The self-inductance $L$ of a solenoid of length $\lambda$ and area of cross-section $A$ with a fixed number of turns $N$ increases as

  • A
    $\lambda$ increases and $A$ decreases
  • B
    $\lambda$ decreases and $A$ increases
  • C
    both $\lambda$ and $A$ increase
  • D
    both $\lambda$ and $A$ decrease

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