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This tag is for questions relating to a non-conducting material called dielectric (or dielectric material). Dielectrics are very much important to explain various phenomena in various fields of physics like solid-state physics, optics, electronics, cell biophysics, etc.

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About the electric field in a dielectric and the capacitor plate

When you insert a dielectric into your capacitor since $\epsilon_{r}>=1$ your electric field in your dielectric will be smaller. … You can show that electric field in the dielectric must be the same as the electric field with no dielectric. …
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Is free space a 'dielectric'?

The medium has a relative permittivity >1 and can be treated as a dielectric. So yes to your first question. …
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