Q. For a common emitter amplifier, the audio signal voltage across the collector resistance 2k$\Omega$ is 2 V. If the current amplification factor of the transistor is 220, and the base resistance is 1.5 $\Omega$, the input signal voltage and base current are
A) 0.1 V and 1 $\mu$A
B) 0.15 V and 10 $\mu$A
C) 1.015 V and 1 A
D) 0.0075 V and 5 $\mu$A
Explanation
(d) The collector current
$I_{C} = \beta I_{b} = \frac{2}{{2 \times 10}^{3}}$
$I_{C} = {1 \times 10}^{- 3}$ A
The base current
$I_{b} = \frac{10^{- 3}}{200}$
$I_{b} = {5 \times 10}^{- 6}$ A
$I_{b} = 5\mu$A
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.