7.3 A point-like electric dipole is placed between the earthed plates of the plane capacitor in 7.2. Its dipole momentum vector \(\vec{p}\) is perpendicular to the plates and the distances of the dipole from the plates are x and d-x respectively. What charges accumulate on each plate?

Capacitors in series share the same charge, and capacitors in parallel share the same voltage. 
The energy per unit volume stored in the capacitor can be found to be: