Question: A 72-nF parallel-plate capacitor has plates that sandwich a dielectric layer that is 75 mm thick. (a) In order to reduce the capacitance, should the

A 72-nF parallel-plate capacitor has plates that sandwich a dielectric layer that is 75 mm thick. 

(a) In order to reduce the capacitance, should the thickness of the dielectric layer be increased or decreased?

(b) Calculate the thickness of the dielectric layer that would reduce the capacitance to 64 nF?

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