Question

In common emitter amplifier, the current gain is $62$.The collector resistance and input resistance are $5k$$\Omega$ an $500$ $\Omega$ respectively. If the input voltage is $0.01V$, the output voltage is

• A. $0.62V$
• B. $6.2V$
• C. $62V$
• D. $620V$

Answer 1

The correct option is B $6.2V$

$\frac{V_0}{V_m}=\frac{R_0}{R_{in}}\times \beta =\frac{5\times {10}^3\times 62}{500}=10\times 62=620$

$V_0=620\times V_{in}=620\times 0.01=6.2V$

$\therefore V_0$ = $6.2V$