Between the plates of a parallel plate capacitor,a plate of thickness $t_1$ and dielectric constant $k_1$ is placed. In the rest of the space,there is another plate of thickness $t_2$ and dielectric constant $k_2$. The potential difference across the capacitor will be

• A
  $\frac{Q}{A\varepsilon_0} \left( \frac{t_1}{k_1} + \frac{t_2}{k_2} \right)$
• B
  $\frac{\varepsilon_0 Q}{A} \left( \frac{t_1}{k_1} + \frac{t_2}{k_2} \right)$
• C
  $\frac{Q}{A\varepsilon_0} \left( \frac{k_1}{t_1} + \frac{k_2}{t_2} \right)$
• D
  $\frac{\varepsilon_0 Q}{A} (k_1 t_1 + k_2 t_2)$