In a common emitter transistor configuration, the ratio of collector current $I_C$ to base current $I_B$ is known as

Solution

1. In a common emitter transistor configuration, the input current is the base current $I_B$ and the output current is the collector current $I_C$.
2. The current amplification factor, denoted by $\beta$, is defined as the ratio of the collector current to the base current.
3. Mathematically, this is expressed as $\beta =\frac{I_C}{I_B}$.
4. Hence the answer is (B).