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A parallel plate capacitor is of area \( 6 \mathrm{~cm}^{2} \) and a
\( \mathrm{P} \) separation \( 3 \mathrm{~mm} \). The gap is filled with three

W dielectric materials of equal thickness (see figure) with dielectric constants \( \mathrm{K}_{1} \), \( =10, \mathrm{~K}_{2}=12 \) and \( \mathrm{K}_{3} \) \( =14 \). The dielectric constant of a material which when fully inserted in above capacitor, gives same capacitance would be :
(A) 4
(B) 14
(C) 36
(D) 12
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