Question: A parallel plate capacitor is connected to a battery. The space between the plates is filled with air. The electric field strength between the plates

A parallel plate capacitor is connected to a battery. The space between the plates is filled with air. The electric field strength between the plates is 20.0 V/m. Then, with the battery still connected, a slab of dielectric (k = 4.0) is inserted between the plates. The thickness of the dielectric is half the distance between the plates.
Find the electric field inside the dielectric.

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