A capacitor is charged by using a battery which is then disconnected. A dielectric slab is introduced between the plates which results in
AIIMS 2010, Medium
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If a dielectric slab of dielectric constant $K$ is filled in between the plates of a capacitor after charging the capacitor (i.e., after removing the connection of battery with the plates of capacitor) the potential difference between the plates reduces to $\frac {1}{K}$ times and the potential energy of capacitor reduces to $\frac {1}{K}$ times but there is no change in the charge on the plates.
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