MHT CET · Physics · Semiconductors
In an n-p-n transistor amplifier, the collector current is 8 mA . If \(80 \%\) of the electrons from the emitter reach the collector, then ( \(\alpha\) and \(\beta\) are current ratios)
- A the base current is 20 mA .
- B the emitter current is 2 mA .
- C \(\alpha=0.8, \beta=4.0\)
- D \(\alpha=4 \cdot 0, \beta=0 \cdot 8\)
Answer & Solution
Correct Answer
(C) \(\alpha=0.8, \beta=4.0\)
Step-by-step Solution
Detailed explanation
\(\alpha = \frac{I_c}{I_e} = 0.8\) \(\beta = \frac{\alpha}{1 - \alpha} = \frac{0.8}{1 - 0.8} = \frac{0.8}{0.2} = 4.0\)
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