Question

A transistor is operated in common emitter configuration at \( V_C = 2V \) such that a change in the base current from 100 μA to 300 μA produces a change in the collector current from 10 mA to 20 mA. The current gain is

• A. 75
• B. 100
• C. 25
• D. 50

Hint:

The current gain \( \beta \) of a transistor is the ratio of change in collector current to change in base current.

Answer 1

The Correct Option is B

The current gain \( \beta \) is defined as \( \beta = \frac{\Delta I_C}{\Delta I_B} \), where \( \Delta I_C \) is the change in collector current and \( \Delta I_B \) is the change in base current. Using the given values, the current gain is calculated to be 100.

Step 2: Conclusion.
The current gain is 100, corresponding to option (b).