Question

In a common emitter transistor configuration, the current gain \(\beta\) is given by

• A. \(\frac{I_B}{I_C}\)
• B. \(\frac{I_C}{I_B}\)
• C. \(\frac{I_E}{I_C}\)
• D. \(\frac{I_C}{I_E}\)

Hint:

For common emitter transistor, current gain is \(\beta=\frac{I_C}{I_B}\).

Answer 1

The Correct Option is B

Concept: In common emitter configuration, input current is base current and output current is collector current.

Step 1: Current gain in common emitter configuration is denoted by: \[ \beta \]

Step 2: It is defined as the ratio of collector current to base current. \[ \beta=\frac{I_C}{I_B} \]

Step 3: Since a small base current controls a large collector current, \(\beta\) is generally large. Therefore: \[ \boxed{\frac{I_C}{I_B}} \]