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A parallel plate capacitor having plates of area \( \mathrm{S} \) and plate separation \( \mathrm{d} \), has capacitance \( \mathrm{C}_{1} \) in air. When two dielectrics of different relative permittivities \( \left(\varepsilon_{1}=2\right. \) and \( \left.\varepsilon_{2}=4\right) \) are introduced between the two
\( P \) plates as shown in the figure, the capacitance becomes \( \mathrm{C}_{2} \). The ratio \( \frac{\mathrm{C}_{2}}{\mathrm{C}_{1}} \) is

W
(A) \( 6 / 5 \)
(B) \( 5 / 3 \)
(C) \( 7 / 5 \)
(D) \( 7 / 3 \)
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