Q180 / 200 · AP EAMCET 2001 · Physics

While a collector to emitter voltage is constant in a transistor, the collector current changes by 8.2 mA when the emitter current changes by $8.3 \mathrm{~mA}$. The value of forward current ratio is

  • Correct answer
    A
    $82$
  • B
    $83$
  • C
    $8.2$
  • D
    $8.3$

Solution

$\begin{aligned} & \Delta I_c=8.2 \mathrm{~mA} \\ & \qquad \Delta I_c=8.3 \mathrm{~mA} \\ & \text { Base current } \Delta I_b=\Delta I_c-\Delta I_c=8.3-8.2=0.1 \mathrm{~mA} \\ & \therefore \text { Forward current ratio }=\frac{\Delta I_c}{\Delta I_b}=\frac{8.2}{0.1}=82\end{aligned}$

Hence, the correct answer is option: 'A'.

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