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A
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C
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D
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Understanding the Answer
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Answer
When a dielectric is placed in an external electric field, the field is first applied to the material. This field exerts forces on the bound electrons and positive ions inside the dielectric. As a result, the electrons shift slightly relative to the ions, creating tiny electric dipoles. These dipoles align with the external field, so the material as a whole becomes polarized. For example, placing a plastic sheet between capacitor plates makes the sheet act like a set of tiny aligned magnets, which reduces the overall electric field inside the capacitor.
Detailed Explanation
When a voltage is applied, the field pushes the bound electrons, creating a pair of opposite charges inside the material. Other options are incorrect because It assumes dipoles appear before the electrons feel a push; It suggests electrons move before the field is there.
Key Concepts
Electric Field Induction
Polarization of Dielectrics
Dipole Formation
Topic
Electric Fields and Dielectrics
Difficulty
hard level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1When a dielectric material is placed in an electric field, what occurs at the molecular level that contributes to its polarization?
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Practice
2
Question 2Which of the following statements about electric field induction in dielectrics are true? (Select all that apply)
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Practice
3
Question 3When an external electric field is applied to an insulator, the material becomes polarized, creating _______ due to the displacement of bound charges.
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Practice
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