Active Filter (using op-amp) Solved Example | Quiz # 265

In this video, the solution of Quiz # 265 is provided.
Here is the detail of the Quiz.
Subject: Analog Electronics
Topic: Active Filter using op-amp
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The Quiz will be helpful to all the students of science and engineering for preparing for university or competitive exams (GATE, IES, RRB JE, etc.)
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[@abhijithanilkumar4959]

Great sir
That's similar to a Wien Bridge oscillator

[@alexsyaneyniiko3417]

where did the j go?

[@allaboutelectronics-quiz]

at 3:23, only the magnitude of the transfer function is considered. Therefore, if you have a+jb then its magnitude will be sqrt (a^2 + b^2).
Similarly, here it is 1 / sqrt ( 1 + (wRC)^2).
I hope it will clear your doubt.