For a constant collector-emitter voltage of 8 V , the collector current of a transistor reached to the value of 6 mA from 4 mA , whereas base current changed from 20 μ A to 25 μ A value. If transistor is in active state, small signal current gain (current amplification factor) will be

Step-by-step solution

Given here, V C E = 8   V , I C = 6   mA from 4   mA and I B = 20   μ A to 25   μ A Current gain is the ratio of change in output current divided by change in input current. For common CE (Common Emitter) configuration, it is the ratio of change in collector current divided by change in base current. Current gain β a v = I C - ' I C I B - ' I B = 6 - 4   mA 25 - 20   μA = 2   mA 5   μA β av = 2 5 × 10 3 = 2000 5 = 400