Question

The current gain of a transistor in common base mode is 0.99. If the change in emitter current is 5 mA then the change in collector current is

• A. 4..95 mA
• B. 5.4 mA
• C. 5.99 mA
• D. 0.198 mA

Answer 1

Answer: (A)

4..95 mA

In common base transistor, current gain is,

$a=\frac{I_c}{I-e}$

Here $I_c$ represents current through collector and $I_e$ represents current through emitter.

In the question it is given,

$a=0.99$

$I_e=5mA$

Therefore,

$I_c=a\times I_e$

$I_c=0.99\times 5mA=4.95mA$