The input resistance of a silicon transistor is 100 W. Base

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The input resistance of a silicon transistor is 100 W. Base current is changed by 40 µA which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4 KΩ. The voltage gain of the amplifier is :

1. 2000
2. 3000
3. 4000
4. 1000

Correct Option: A

Voltage gain

(A_v) =	V_out	-	I_out	×	R_out
	V_in		I_in		R_in

A_v =	2 × 10^-3	×	4 × 10³	= 2 × 100 = 2000
	40 × 10⁶		100