Question

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

• A. 0.35 mA
• B. 0.29 mA
• C. 0.39 mA
• D. 0.43 mA

Answer 1

Answer: (B)

0.29 mA

Answer 2

$\alpha=\frac{I_{C}}{I_{E}}$ $\therefore I_{C}= \alpha I_{E}=0.96\times7.2=6.91$mA Now, $I_{E} = I_{C} + I_{B}$ $\therefore I_{B}=I_{E}-I_{C}=7.2-6.91=0.29$ mA