Q158 / 160 · TS EAMCET 2023 (12 May Shift 1) · Physics
In a transistor, the base current is $10 \mu \mathrm{A}$ and the emitter current is $1 \mathrm{~mA}$, then the collector current is
- Correct answerA$990 \mu \mathrm{A}$
- B$100 \mu \mathrm{A}$
- C$1010 \mu \mathrm{A}$
- D$90 \mu \mathrm{A}$
Solution
Base current, $i_B=10 \times 10^{-6} \mathrm{~A}=10 \mu \mathrm{A}$ Emitter current, $\mathrm{i}_{\mathrm{E}}=1 \times 10^{-3} \mathrm{~A}=1000 \mu \mathrm{A}$ $\mathrm{i}_{\mathrm{E}}=\mathrm{i}_{\mathrm{B}}+\mathrm{i}_{\mathrm{C}}$
Collector current $\mathrm{i}_{\mathrm{C}}=\mathrm{i}_{\mathrm{E}}-\mathrm{i}_{\mathrm{B}}$ $=1000-10=990 \mu \mathrm{A}$
Hence, the correct answer is option: 'A'.