If $\alpha$ is the current gain in a $CB$ circuit and $\beta$ is the current gain in a $CE$ circuit,then $\alpha / \beta$ = ......

  • A
    $\frac{\Delta I_B}{\Delta I_E}$
  • B
    $\frac{\Delta I_E}{\Delta I_B}$
  • C
    $\frac{\Delta I_B}{\Delta I_C}$
  • D
    $\frac{\Delta I_C}{\Delta I_E}$

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