The capacitance $C_x$ of a capacitive type sensor is $(1000x) pF,$ where x is the input to the sensor. As shown in the figure, the sensor is excited by a voltage $\text{10 sin(100}\pi\: t) V$. The other terminal of the sensor is tied to the input of a high input impedance amplifier through a shielded cable, with shield connected to ground. The cable capacitance is $\text{100 pF}$. The peak of the voltage $V_A$ at the input of the amplifier when $\text{x=0.1 (in volts)}$ is _________.