A parallel plate capacitor C with plates of unit area and separation s is filled with a liquid of dielectric constant $K=2$. The level of liquid is $\frac{d}{3}$ initially. Suppose the liquid level decreases at a constant speed V , the time constant as a function of time $t$ is Figure
Select the correct option:
A
$\frac{6 \varepsilon_0 R}{5 d+3 V t}$
B
$\frac{(15 d+9 V t) \varepsilon_0 R}{2 d^2-3 d V t-9 V^2 t^2}$
C
$\frac{6 \varepsilon_0 R}{5 d-3 V t}$
D
$\frac{(15 d-9 V t) \varepsilon_0 R}{2 d^2+3 d V t-9 V^2 t^2}$
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