A) \[0.34\ m\]
B) \[1.33\ m\]
C) \[13.4\ m\]
D) \[33.9\ m\]
Correct Answer: D
Solution :
If length of the foil is l then \[C=\frac{k{{\varepsilon }_{0}}(l\times b)}{d}\] Þ \[2\times {{10}^{-6}}=\frac{2.5\times 8.85\times {{10}^{-12}}(l\times 400\times {{10}^{-3}})}{0.15\times {{10}^{-3}}}\] Þ l = 33.9 m
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