The formula for capacitance of a parallel plate capacitor is: \[ C = \frac{\varepsilon_0 A}{d} \] To decrease \(C\), either \(A\) (area) must decrease or \(d\) (distance) must increase.
Since only distance can be increased in the given options, that is the correct answer.
Two condensers \( C_1 \) & \( C_2 \) in a circuit are joined as shown in the figure. The potential of point A is \( V_1 \) and that of point B is \( V_2 \). The potential at point D will be:
