The transconductance gm of the transistor shown below in

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The transconductance gm of the transistor shown below in figure is 10 mS. The value of the input resistance R_in is–

1. 10·0 kΩ
2. 8·3 kΩ
3. 5·0 kΩ
4. 2·5 kΩ

Correct Option: C

The given figure

Given, g_m = 10 mS

We know that R_in =		h_fe	=	β
		g_m		g_m

=	50	= 5 kΩ
	10 mS