An Air-Filled Parallel Plate Capacitor Is Charged Until Its Surface

An air-filled parallel plate capacitor is charged until its surface charge density reaches σ0, and then the voltage source is removed. If an insulator with dielectric constant 5.0 is inserted between the plates, what happens to the electric field strength, assuming 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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