Question

Current gain ${\beta }_{AC}$ in common emitter mode of transistor is

• A. ${\beta }_{AC}=\frac{△I_C}{△I_B},V_C=constant$
• B. ${\beta }_{AC}=\frac{△I_B}{△I_C},V_C=constant$
• C. ${\beta }_{AC}=\frac{△I_C}{△I_E},V_C=constant$
• D. ${\beta }_{AC}=\frac{△I_E}{△I_C},V_C=constant$

Answer 1

The correct option is A ${\beta }_{AC}=\frac{△I_C}{△I_B},V_C=constant$

It is ${\beta }_{AC}=\frac{△I_C}{△I_B},V_C=constant$
Collector voltage is to be kept a constant.