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

  1. $\frac{R_3}{R_4}=\frac{R_1}{R_2}$                                    $\omega =\frac{1}{\sqrt{R_1C_1R_2C_2}}$ 
  2. $\frac{R_2}{R_1}=\frac{C_2}{C_1}$                                    $\omega =\frac{1}{R_1C_1R_2C_2}$
  3. $\frac{R_3}{R_4}=\frac{R_1}{R_2}+\frac{C_2}{C_1}$                $\omega =\frac{1}{\sqrt{R_1C_1R_2C_2}}$ 
  4. $\frac{R_3}{R_4}+\frac{R_1}{R_2}=\frac{C_2}{C_1}$                $\omega =\frac{1}{R_1C_1R_2C_2}$
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