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In an amplifier, negative feedback is introduced with feedback fraction $\beta =0.01$. If voltage given with out negative feed back. is $2500$ what is voltage gain with negative feed back.

$(a)\;99.2 \\ (b)\;96.15 \\ (c)\;45.2 \\ (d)\;60.2 $

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$A= 2500$
$B= 0.01$
Voltage given with negative feedback is
$A_f =\large\frac{A}{1+A \beta}$
$\qquad =\large\frac{2500}{1+2500 \times 0.01}$
$ \qquad=\large\frac{2500}{26}$
$\qquad =96.15 $
Hence b is the correct answer.
answered Jan 28, 2014 by meena.p

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