# NEET Physics Nuclei Questions Solved

NEET - 2012

The input resistance of a silicon transistor is

100 $\mathrm{\Omega }$. Base current is changed by 40 $\mathrm{\mu A}$

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 k$\mathrm{\Omega }$.

The voltage gain of the amplifier is

(a) 2000

(b) 3000

(c) 4000

(d) 1000

We know

On putting given values

${\mathrm{V}}_{\mathrm{g}}=\frac{2×{10}^{-3}}{40×{10}^{-6}}×\frac{4×{10}^{3}}{100}\phantom{\rule{0ex}{0ex}}{\mathrm{V}}_{\mathrm{g}}=2000$

Difficulty Level:

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