question_answer

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is :   JEE Main Online Paper (Held On 10 April 2016)

A)                

B)

C)                          

D)

Correct Answer: A

Solution :

             For common emitter configuration, the input characteristics graph is as shown \[{{r}_{i}}=\frac{\Delta {{V}_{I}}}{\Delta {{I}_{i}}}\Rightarrow \frac{1}{{{r}_{i}}}=\frac{d{{I}_{i}}}{d{{V}_{i}}}\]= slope