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  • In a similar base configuration, the current emitter changes by 2mA wgen emitter voltage is changed to 200 mA at  a fixed collector to base voltage. the input resistance is <div class

In a similar base configuration, the current emitter changes by 2mA wgen emitter voltage is changed to 200 mA at  a fixed collector to base voltage. the input resistance is 

Option: 1

100Ω


Option: 2

1000Ω


Option: 3

2.5 Ω


Option: 4

4Ω


Answers (1)

best_answer

Given that:

\begin{aligned} & V=200 \mathrm{mV}=200 \times 10^{-3} \mathrm{~V} \\ & I=2 \mathrm{~mA}=2 \times 10^{-3} \mathrm{~A} \end{aligned}

The dynamic resistance is the ratio of change in emitter voltage to the change in emitter current.

\begin{aligned} & r_d=\frac{\Delta V}{\Delta I} \\ & r_d=\frac{200 \times 10^{-3}}{2 \times 10^{-3}}=100 \Omega \end{aligned}

Posted by

himanshu.meshram

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