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A parallel plate capacitor with air between the plates has a capacitance of 12 pF. The separation between its plates is 'd' .The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant ${\mathrm{k}}_1=3$ and thickness $\frac{\mathrm{d}}{3}$ while the other one has dielectric constant ${\mathrm{k}}_2=6$ and thickness $\frac{2\mathrm{d}}{3}.$ Capacitance of the

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