Physics · Electrostatics

An air-filled parallel plate capacitor of plate area 2 cm2 and plate separation 4 mm has a capacitance C. Now, the space between the plates is completely filled with two slabs of the same area but thicknesses 1 mm and 3 mm, having dielectric constants K and 3K respectively. If the new capacitance is C', what is the ratio C'C?

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