For ac circuit shown in figure, R = 100 k$\Omega$ and C = 100 pF and the phase difference between $V_{in}$ and ($V_B-V_A$) is $90^\circ$. The input signal frequency is $10^x$ rad/sec, where 'x' is ... Voltage difference problem

 For ac circuit shown in figure, R = 100 k$\Omega$ and C = 100 pF and the phase difference between $V_{in}$ and ($V_B-V_A$) is $90^\circ$. The input signal frequency is $10^x$ rad/sec, where 'x' is ____