The figure shows a capacitor having three layers between its plates. Layer x is vacuum, y is conductor and z is a dielectric. Which of the following change(s) will result in increase in capacitance?
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Solution
C1=Aε0k1d,C2=Ak2ε0d,C2=Ak3ε0d
As all are in series, the dielectric constant of x,y and z are k=1,k=∞,k=k respectively. so the equivalent capacitance will be,