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Assume there is a parallel plate capacitor connected to 5V DC source. The dielectric present in between the plates is air. Now we place a dielectric on top of plate connected to positive terminal of the DC source. (assume relative permittivity of dielectric to be 5). What will be the effect of such a configuration on the capacitance of the parallel plate? An image for the configuration is provided below:

enter image description here

Rupert
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1 Answers1

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For an ideal capacitor, there is no electric field outside of the gap between them. If there is no field, there is no polarization of the medium - so "the capacitor doesn't know it's there", and there is no effect on the capacitance.

Floris
  • 119,981