Q158 / 160 · TS EAMCET 2018 (04 May Shift 2) · Physics

In a junction transistor, the collector current changes by $6.8 \mathrm{~mA}$, if the emitter current is changed by $7 \mathrm{~mA}$. For such transistor, the current amplification factor is

  • A
    30
  • Correct answer
    B
    34
  • C
    40
  • D
    45

Solution

Given, $\Delta I_C=6.8 \mathrm{~mA}$ $$ \text { So, } \quad \begin{aligned} \Delta I_E & =7 \mathrm{~mA} \\ \Delta I_B & =0.2 \mathrm{~mA} \end{aligned} $$ $\because$ Current amplification is $>1$ So, it must be $\mathrm{CE}$ configuration Amplification factor, $\beta=\frac{\Delta I_C}{\Delta I_B}=\frac{6.8 \mathrm{~mA}}{0.2 \mathrm{~mA}}$

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

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