In regard to Wien bridge oscillator:

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In regard to Wien bridge oscillator:

1. the bridge is unbalanced so that the amplitude of oscillations can be stable
2. at the frequency of oscillations the bridge is exactly balanced
3. in the bridge arms containing only resistors, one of the resistors is temperature sensitive to stable the amplitude of oscillations
4. at the frequency of oscillations the gain is exactly 3

Correct Option: C

NA