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In the Wien Bridge oscillator circuit shown in figure, the bridge is balanced when

- $\dfrac{R_3}{R_4}=\dfrac{R_1}{R_2}\, \: \: \omega =\dfrac{1}{\sqrt{R_1C_1R_2C_2}} \\$
- $\dfrac{R_2}{R_1}=\dfrac{C_2}{C_1}, \: \: \omega =\dfrac{1}{R_1C_1R_2C_2} \\$
- $\dfrac{R_3}{R_4}=\dfrac{R_1}{R_2}+\dfrac{C_2}{C_1}, \: \: \omega =\dfrac{1}{\sqrt{R_1C_1R_2C_2}} \\$
- $\dfrac{R_3}{R_4}+\dfrac{R_1}{R_2}=\dfrac{C_2}{C_1}, \: \: \omega =\dfrac{1}{R_1C_1R_2C_2}$

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