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A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is 4 kV/cm, the electric field in the region B, in kV/cm, is ________.

1. 1
2. 2
3. 4
4. 16

Correct answer: 2

Solution

The electric field in a capacitor filled with different dielectrics is inversely proportional to the dielectric constants of the materials. Since the electric field in region A is 4 kV/cm and region B has a different dielectric constant, the electric field in region B is reduced to 2 kV/cm.

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