Two identical parallel-plate air capacitors, $C_1$ and $C_2$, each of capacitance $C$, are connected

Question

Two identical parallel-plate air capacitors, $C_1$ and $C_2$, each of capacitance $C$, are connected in series to a battery of steady EMF $V$. After the circuit reaches steady state, the space between the plates of $C_1$ is completely filled with a uniform isotropic dielectric of relative permittivity $K$. Which of the following statements is/are CORRECT?

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