Find the capacitance of a capacitor in which the space between the plates is partly filled with a dielectric (Fig. 25.5)

Explanation

Here we have two capacitors connected in parallel, with capacitances
`C_(1)=(espi_(0)S_(1))/(d)=(epsi_(0)S(l_(0)-l))/(dl_(0))`
and `C_(2)=(epsi epsi_(0)S_(2))/(d)=(epsi epsi_(a) Sl)/(dl_(0))`