Why do dielectrics create opposite electric fields when placed in a field?

Why do dielectrics create opposite electric fields when placed in a field?

• A. To heat the dielectric
• B. To magnetize the material
• C. To prevent dielectric breakdown
• D. To attract charge

Answer: (C)

When a dielectric sits in an external electric field, its molecules polarize: electrons shift relative to nuclei, creating tiny dipoles. The bound charges that appear on the surfaces of these polarized molecules generate an internal electric field that points opposite to the external field. This opposing field reduces the net field inside the material. That reduction helps keep the internal field from becoming strong enough to cause dielectric breakdown, which is why this effect is described as preventing breakdown. It isn’t about heating or magnetizing the material, and polarization isn’t about attracting charge in the sense those other options imply.

When a dielectric sits in an external electric field, its molecules polarize: electrons shift relative to nuclei, creating tiny dipoles. The bound charges that appear on the surfaces of these polarized molecules generate an internal electric field that points opposite to the external field. This opposing field reduces the net field inside the material.

That reduction helps keep the internal field from becoming strong enough to cause dielectric breakdown, which is why this effect is described as preventing breakdown. It isn’t about heating or magnetizing the material, and polarization isn’t about attracting charge in the sense those other options imply.