NEET Physics Nuclei Questions Solved

NEET - 2012

The input resistance of a silicon transistor is

100 Ω. Base current is changed by 40 μA

which results in a change in collector current

by 2 mA. This transistor is used as a commom-

emitter amplifier with a load resistance of 4 kΩ.

The voltage gain of the amplifier is

(a) 2000

(b) 3000

(c) 4000

(d) 1000

We know

           Vg=βRLRi=ICIBRLRi      so, β=ICIB

On putting given values 

      Vg=2×10-340×10-6×4×103100Vg=2000

Difficulty Level:

  • 42%
  • 30%
  • 24%
  • 5%