Question

The current gain of a common base transistor circuit is$0.96.$ On changing the emitter current by $10mA$, the change in the collector current will be

• A. $9.6mA$
• B. $0.4mA$
• C. $19.6mA$
• D. $24mA$

Answer 1

The correct option is A

$9.6mA$

Step 1:Given

$$\begin{gathered} \alpha =0.96 \\ \Delta I_E=10mA \end{gathered}$$

Step 2: Formula used

Note that the current gain for common bases transistor is,

$\alpha =\left(\frac{\Delta I_c}{\Delta I_E}\right)$

Step 3: Finding change in the collector current

Therefore,

$$\begin{gathered} =>0.96=\frac{\Delta I_c}{10} \\ =>\Delta I_c=9.6mA \end{gathered}$$

Therefore the change in collector current will be $9.6mA$.

Hence, the correct option is (A).