The separation be A. Charge on the capacitor

B. Potential difference across the capacitor

C. Energy of the capacitor

D. Energy density between the plates.

When we increase the separation between the plates of a charged parallel capacitor the value of Capacitance decreases by the formula

Where,

d=separation between the plates

A=area of plates

ϵ₀=absolute permittivity of vacuum

Charge on the capacitor remains unchanged because no charge transfer takes place.

∴ Potential difference across the capacitor changes by the formula

Where,

Q= charge on the capacitor

C=capacitance

Similarly Energy across the capacitor given by

Where,

C=capacitance

V=potential difference across capacitor

So, as V changes energy stored also changes

Therefore, on increasing separation between the plates of capacitor, potential difference and energy of capacitor changes whereas charge and energy density remains the same.