A parallel plate capacitor of plate area A and plate separation d is charged to potential V and then the battery is disconnected. A slab of dielectric constant k is then inserted between he plates. If Q, E and W denote respectively, the magnitude of charge on each plate, the electric field between the plates after insertion of slab and work done on the system in the process of insertion of the slab, then which of the following relation is INCORRECT
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A battery is disconnected after charging then charge on capacitor will remain constant and it is given as
After insertion of slab capacitance becomes
The potential difference across the plates and electric field between the plates will now be
And 
Work doen in insertion of slab is given as
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