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Physics Question on electrostatic potential and capacitance

A composite parallel plate capacitor is made up of 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 conducting foil is _____V.
A composite parallel plate capacitor is made up of two different dielectric materials with different thickness

Answer

C1C2=3×t2t1×4=32\frac{C_1}{C_2}=3×\frac{t_2}{t_1}×4=\frac{3}{2}

qC1=v1\frac{q}{C_1}=v_1

qC2=v2\frac{q}{C_2}=v_2

v1v2=C2C1=23\frac{v_1}{v_2}=\frac{C_2}{C_1}=\frac{2}{3}