MHT CET · Physics · Semiconductors
The collector supply voltage is 6 V and a voltage drop across a resistor of \(600 \Omega\) in the collector circuit is 0.6 V , in a circuit of transistor connected in common emitter mode. If the current gain is 20 then the base current is
- A 0.25 mA
- B 0.05 mA
- C \(0.12 \mathrm{~mA}\)
- D \(0.02 \mathrm{~mA}\)
Answer & Solution
Correct Answer
(B) 0.05 mA
Step-by-step Solution
Detailed explanation
For collector current, \(\mathrm{I}_{\mathrm{C}}=\frac{\text { Collector voltage }}{\text { Resistance }}=\frac{0.6}{600}=1 \mathrm{~mA}\) Current gain, \(\beta=\frac{I_C}{I_B}=20\)
\(\therefore \quad 20=\frac{1}{I_B} . \quad \Rightarrow \quad I_B=0.05 \mathrm{~mA}\)
\(\therefore \quad 20=\frac{1}{I_B} . \quad \Rightarrow \quad I_B=0.05 \mathrm{~mA}\)
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