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  4. A parallel plate capacitor is immersed in an oil of dielectric constant 2. The field between the plates is:

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Q. A parallel plate capacitor is immersed in an oil of dielectric constant $2$. The field between the plates is:

Jharkhand CECEJharkhand CECE 2004Electrostatic Potential and Capacitance

Solution:

When a dielectric material is inserted between the plates of a capacitor (keeping the charge to be constant) or capacitor is immersed in dielectric medium, the electric field decreases by a factor $k$ (the dielectric constant of the dielectric)
$\therefore E=\frac{E_{0}}{k}$
Given, $k=2$ Hence, $E=\frac{E_{0}}{2}$
Thus, electric field between the plates is decreased proportional to $\frac{1}{2}$.