For the given circuit, input resistance RI = 20?, hfe = 50. Output resistance = ?. Find the new values of input and output resistance, if a base resistance of 2k? is added to the circuit.
A)ri = 20?, ro = ?
B)ri = 20?, ro = 2k?
C)ri = 59?, ro = ?
D)ri = 59?, ro = 2k?

Question

Quizplus · Accepted Answer

The input resistance with the base resistance added becomes ri = RI + (hfe * base resistance) = 20 + (50 * 2k) = 59?. The output resistance is not directly affected by the base resistance, so it remains unspecified.

For the Given Circuit, Input Resistance RI = 20?, Hfe