What is the input resistance of the transistor if a change of 200 mV in base-emitter voltage causes a change of 100μA in the base current?
Answer & explanation
Correct answer: option 1
ΔVbe=200 mV=2×10−3V,
ΔIb=100μA=10−6 A, For transistors,
the input resistance is Ri=ΔVbe/ΔIb= 2×10−3/10−6,
Ri=2×103=2 KΩ