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

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?

A) it increases by a factor of 5
B) it increases by a factor of 25
C) it decreases by a factor of 5
D) it decreases by a factor of 25
E) it stays the same

Correct Answer:

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