SSC JE Electrical Engineering 2017 Set 3 Paper

Electric field intensity between two parallel plate capacitor.$\overrightarrow{\mathit{E}}=\frac{{\mathrm{f}}_{\mathit{s}}}{∊}$
${\mathit{f}}_{\mathit{s}}$ is Surface charge Density
∊ is Permittivity of medium If Dielectric is placed in parallel plate then electric field strength decrease because for same charge density permittivity increase.
$\downarrow \overrightarrow{\mathit{E}}=\frac{{\mathrm{f}}_{\mathit{s}}}{∊\uparrow }$
and also due to charge polarized in opposite direction in dielectric medium
$\overrightarrow{\mathit{E}}={\overrightarrow{\mathit{E}}}_{\mathrm{external}}-{\overrightarrow{\mathit{E}}}_{\mathrm{internal}}$
Electric field strength reduce due to induced electric field is opposite direction of external field.