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(B) For a parallel plate capacitor connected to a battery,the potential difference $(V)$ across the plates remains constant. Since the capacitor has t

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(B) For a parallel plate capacitor connected to a battery,the potential difference $(V)$ across the plates remains constant. Since the capacitor has two dielectric layers in series,the electric field $(E)$ in each dielectric is given by $E = \frac{V}{d_{eff}}$,where $d_{eff}$ is the effective thickness. Specifically,the electric field in a dielectric medium is $E = \frac{E_0}{K}$,where $E_0$ is the field in vacuum and $K$ is the dielectric constant. In the first region $(0 In the second region $(d Since $K_1  E_2$. Therefore,the electric field is higher in the first region and lower in the second region,and it remains constant within each dielectric layer. This corresponds to the graph where the field value drops at $x = d$ and remains constant in both regions.

$A$ parallel plate capacitor has two layers of dielectric as shown in the figure. This capacitor is connected across a battery. Which graph shows the variation of electric field $(E)$ with distance $(x)$ from the left plate?

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