Question

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

• A. $50$
• B. $75$
• C. $100$
• D. $25$

Answer 1

The correct option is C $100$

The base current changes from $100\mu A$ to $300\mu A$ and produces a change in the collector current from $10mA$ to $20mA$

The change in collector current is $10mA$

The change in base current is $200\mu A$

The current gain is $\frac{10000}{200}=50$

Therefore option $C$ is correct.