In a common - emitter amplifier, output resistance is 5000Ω and input resitance is 2000Ω. If peak value of signal voltage is 10mV and β=50, then the peak value of output voltage is
A
5×10−6V
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B
2.5×10−4V
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C
1.25V
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D
125V
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Solution
The correct option is C1.25V Voltage amplification (Av)is Av=−βR0Ri =−50×50002000
Av=V0Vmax V010×10−3=−125(∵Vmax=10×10−3) Output Voltage V0=−1.25V