Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 79

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81. The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is $7.2 mA$, then the base current is

======= ####81. The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is $7.2 mA$, then the base current is

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/semiconductor-electronics-materials-devices-and-simple-circuits/semiconductor-electronics-materials-devices-and-simple-circuits—result-question-79.md (a) $0.29 mA$

(b) $0.35 mA$

(c) $0.39 mA$

(d) $0.43 mA$

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Answer:

Correct Answer: 81. (a)

Solution:

  1. (a) Current gain $(\alpha)=0.96$

$I_e=7.2 mA$

$\frac{I_c}{I_e}=\alpha=0.96$

$I_c=0.96 \times 7.2 mA=6.91 mA$

$I_e=I_c+I_b$

$\stackrel{e}{\Rightarrow} I_b^{c}=I_e-I_c=7.2-6.91=0.29 mA$