Gate/GATE ECE Mcq MCQs :- multiple choice questions and answers. e.g Gate MCQS,Gate Mock Tests , Gate Practice Papers ,Gate Sample Test,Gate Sample questions

Question 1: The current ib through the base of a silicon npn transistor is 1 + 0.1 cos(10000 π t) mA. At 300 K, the rπ in the small signal model of the transistor is

250 Ω

27.5 Ω

25 Ω

22.5 Ω