A) \[5\mu F\]
B) \[7.5\mu F\]
C) \[22.5\mu F\]
D) \[30\mu F\]
Correct Answer: D
Solution :
By using \[{{C}_{air}}=\frac{{{\varepsilon }_{0}}A}{d},\] \[{{C}_{medium}}=\frac{{{\varepsilon }_{0}}A}{d-t+\frac{t}{K}}\] For K = ¥ \[{{C}_{medium}}=\frac{{{\varepsilon }_{0}}A}{d-t}\] Þ \[\frac{{{C}_{m}}}{{{C}_{a}}}=\frac{d}{d-t}\] Þ \[\frac{{{C}_{m}}}{15}=\frac{6}{6-3}\] Þ \[{{C}_{m}}=30\mu \,C\]
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