Let the capacitances be and
The battery has a potential of .
(a) The electric field energy values before the slab was inserted is
the insertion of the slab increases the capacitances as and
The electric field energy values after the slab of dielectric constant (K) is inserted is
(b) In series connection, charges across each capacitor is same.
Old charge configuration=
New charge configuration=
(C) Potential difference change according to the capacitance. The new potential differences would be and .
Here, we have assumed that the battery is not disconnected.
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