A composite parallel plate capacitor is made up to two different dielectric materials with different thickness (t₁ and t₂) as shown in figure. The two different dielectric materials are separated by a conducting foil F. The  voltage of the conducing foil is ___________V.

Capacitance of each capacitor

$C_1=\frac{A3{\epsilon }_0}{\frac{1}{2}}=6A{\epsilon }_0$

$C_2=A4{\epsilon }_0=4A{\epsilon }_0$

Equivalent capacitance

$\Delta v_2=\frac{240A{\epsilon }_0}{4A{\epsilon }_0}=60v$

$v_{foil}=60v$

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