Capacitor - Electromagnetism - Physics Previous Year Questions

Capacity of a parallel plate capacitor in the absence of dielectric medium is $C_0$. A sheet of dielectric constant $k$ and thickness of one-fourth of the plate separation is inserted between the plates. If the new capacity is $C$, then $\frac{C}{C_0}$ is

A network of four capacitors of capacity equal to $C_1=C, C_2=2 C, C_3=3 C$ and $C_4=4 C$ are connected to a battery, as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is $\_\_\_\_$

$$\text { A } 2 \mu \mathrm{~F} \text { capacitor is charged as shown, }$$

When switch $S$ is shifted to position $2, \%$ of energy lost is