A change of 0 . 04 volts takes place between the base and the emitter when an input signal is connected to…

A change of 0.04 volts takes place between the base and the emitter when an input signal is connected to the common emitter transistor amplifier. As a result, 20 μA change takes place in the base current and a change of 2 mA takes place in the collector current. The input resistance and AC current gain are
  1. 1 kΩ &100
  2. 2 kΩ &100
  3. 2 kΩ &1000
  4. 1 kΩ & 200

Solution

Given: ΔIb=20 μA ΔIc=2 mA

ΔVBE=0.04 V

Input resistance Rinput =VBEΔIb=0.0420×10-6=2 kΩ

A.C. current gain β=ΔIcΔIb=2×10-320×10-6=100

Asked in: AP EAMCET 2021 (20 Aug Shift 2)

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