Semiconductor Electronics Materials Devices And Simple Circuits Ques 90
90. 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
[1996]
(a) $0.29 $ $mA$
(b) $0.35 $ $mA$
(c) $0.39 $ $mA$
(d) $0.43 $ $mA$
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Answer:
Correct Answer: 90.(a)
Solution:
- (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 $ $mA$
$I_e=I_c+I_b$
$\Rightarrow I_b^{c}=I_e-I_c=7.2-6.91=0.29 $ $mA$
BETA
