Given: The initial capacitance is
(a) When voltage supply remains connected:
Capacitance of new capacitor is given as,
where, the capacitance of the capacitor when mica sheet is present between the plates is
By substituting the given values in the above equation, we get,
Therefore, the capacitance of the capacitor changes to
(b) After the supply was disconnected:
Capacitance of new capacitor is given as,
By substituting the given values in the above equation, we get,
The charge on the capacitor is given as,
where, the charge on the capacitor is
By substituting the given values in the above equation, we get,
Therefore, the capacitance of the capacitor changes to