and surface area A1 and another with & and A2. The objective of this problem is to show that the capacitance C of the configuration shown in Fig. P4.56(a) is equivalent to two capacitances in parallel, as illustrated in Fig. P4.56 (b),with C=C1+C2, where \begin{array}{l} C_{1}=\frac{\varepsilon_{1} A_{1}}{d} \\ C_{2}=\frac{\varepsilon_{2} A_{2}}{d} \end{array} To this end, proceed as follows:

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