AP EAMCET · PHYSICS · Semiconductors
In a CE transistor when the base current increases by 60 \(\mu \mathrm{A}\), change in base-emitter voltage is \(1.2 \mathrm{~V}\). Then the input resistance is
- A \(1000 \Omega\)
- B \(5000 \Omega\)
- C \(2000 \Omega\)
- D \(20000 \Omega\)
Answer & Solution
Correct Answer
(D) \(20000 \Omega\)
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { } \mathrm{I}_{\mathrm{b}}=60 \mu \mathrm{A}=60 \times 10^{-6} \mathrm{~A} \\ & V_{\mathrm{BE}}=1.2 \mathrm{~V} \\ & \mathrm{~V}_{\mathrm{BE}}=\mathrm{I}_{\mathrm{b}} \mathrm{R}_{\text {in }} \\ & \Rightarrow \mathrm{R}_{\text {in…
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