(b) From the formula ,
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ C = \ \frac{\varepsilon_{0}A}{d - t + \frac{t}{K}}$
$\Rightarrow$ Here, $\ K = \infty\ \ \ \ and\ t \rightarrow 0$
So, $\ \ \ \ \ \ \ \ \ C = \ \frac{\varepsilon_{0}A}{d + 0} = \ \frac{\varepsilon_{0}A}{d} = C_{0}$
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