A) \[2\mu \,F\]
B) \[15.5\mu \,F\]
C) \[26.6\mu \,F\]
D) \[32\mu \,F\]
Correct Answer: C
Solution :
\[C=\frac{{{\varepsilon }_{0}}A}{d}\] and \[C'=\frac{{{\varepsilon }_{0}}A}{\left( d-t+\frac{t}{K} \right)}\]Þ \[\frac{C}{C'}=\frac{\left( d-t+\frac{t}{K} \right)}{d}\] \[\Rightarrow \frac{20}{C'}=\frac{\left( 2\times {{10}^{-3}}-1\times {{10}^{-3}}+\frac{1\times {{10}^{-3}}}{2} \right)}{2\times {{10}^{-3}}}\]Þ\[C'=26.6\mu F\]
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