Q.

For the given circuit, input resistance RI = 20Ω, hfe = 50. Output resistance = ∞. Find the new values of input and output resistance, if a base resistance of 2kΩ is added to the circuit.

A. ri = 20Ω, ro = ∞
B. ri = 20Ω, ro = 2kΩ
C. ri = 59Ω, ro = ∞
D. ri = 59Ω, ro = 2kΩ
Answer» C. ri = 59Ω, ro = ∞
Explanation: ri = 20k = hie/(1+hfe) = hie/51 hie =1020 Ω
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