In common emitter mode of transistor, the d.c. current gain is 20, the emitter current is 7 mA. The collector current is

Step-by-step solution

Given the d.c. current gain in common emitter mode, = 20 , and the emitter current, I_E = 7 mA. The relation between the common base current gain and common emitter current gain is given by: = 1 + Substituting the value of : = 20 1 + 20 = 20 21 We also know that = I_C I_E , where I_C is the collector current. I_C = I_E I_C = 20 21 7 I_C = 20 3 mA Answer: 20 3 mA