A parallel plate condenser is filled with two dielectrics as shown. Area of each plate is $A\;metr{e^2}$ and the separation is $t$ $metre$. The dielectric constants are ${k_1}$ and ${k_2}$ respectively. Its capacitance in farad will be
AIIMS 2001, Easy
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(b) The two capacitors are in parallel so $C = \frac{{{\varepsilon _0}A}}{{t \times 2}}({k_1} + {k_2})$
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