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  4. The voltage gain of an amplifier stage is 100 . The gain expressed in dB is :

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Q. The voltage gain of an amplifier stage is $100$ . The gain expressed in $dB$ is :

NTA AbhyasNTA Abhyas 2022

Solution:

Voltage gain in Decibel scale $=20\left(log\right)_{10}\left(100\right)$ $=20\left(log\right)_{10}\left(10\right)^{2}=40dB$