A parallel plate capacitor has an air dielectric.The capacitor is charged with surface charge density $\sigma_{0}$ and then the voltage source is removed.When an insulator with dielectric constant 5.0 is inserted between the plates,what happens to the electric field strength if the surface charge density does not change?

Question

Quizplus · Accepted Answer

When an insulator with dielectric constant 5.0 is inserted between the plates, the electric field strength decreases by a factor of 5 because the electric flux stays the same and the capacitance increases by a factor of 5 due to the presence of the insulating material (C = εA/d, where ε is the dielectric constant). Therefore, as the voltage remains constant while capacitance increases, electric field decreases.

A Parallel Plate Capacitor Has an Air Dielectric σ0\sigma_{0}σ0​ And Then the Voltage Source Is Removed

A Parallel Plate Capacitor Has an Air Dielectric $\sigma_{0}$ And Then the Voltage Source Is Removed