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
  • A$\frac{{{\varepsilon _0}A}}{t}({k_1} + {k_2})$
  • B$\frac{{{\varepsilon _0}A}}{t}.\frac{{{k_1} + {k_2}}}{2}$
  • C$\frac{{2{\varepsilon _0}A}}{t}({k_1} + {k_2})$
  • D$\frac{{{\varepsilon _0}A}}{t}.\frac{{{k_1} - {k_2}}}{2}$
AIIMS 2001, Easy
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