The correct option is
C Q is constant, V and U decrease
When a condenser is changed and the battery is removed the charge present on condenser remains same.
electric field is given by
σϵ0Now when dielectric plate is placed between
C=Kϵ0Ad , C increases
We know
Q=C.VV=QCas C increases with addition of dielectric V decreases
∴ As V decreases U decreases
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