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When a parollel plate capacitor is connected with a battery, the potential drop generated accross the capacitor is same as that of piotential drop generated across battery. i.e Potential drop is constant 

When a slab of dielectric material is introduced between the plates of capacitan then its capacitance will change and hence charge well also change

Let, initial copacitance \(=C\) and charge \(=Q\)

After introducing slab Copacitance \(=K C\) and charge \(=q\)

Since,

\(E_1=E_2\)

\(\frac{Q}{C}=\frac{q}{K C} \quad \Rightarrow q=K Q\)

Sinc, \(k\) is always greater than 1 for all dielectric materials

\(\therefore q > Q\)

Hence charge on the plates in comparsion with earlier charge is more