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Electric Materials Properties Quiz

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Questions and Answers

What is the purpose of a dielectric material in an electric field?

To allow the electric field to pass through (correct)

To block the electric field

To absorb the electric field

To create an electric field

In what type of material is the electric permittivity (ER) equal to zero?

Semiconductors

Insulators

Metals (correct)

Dielectric materials

What is the nature of an electric dipole?

It has only positive electric charges

It consists of two positive charges

It consists of two negative charges

It has a separation between a positive and a negative electric charge (correct)

Which chapter in the course covers the topic of optical properties of materials?

Chapter 21 Signup and view all the answers

What is the function of field vectors and polarization in electrical properties?

Aligning in the direction of the electric field Signup and view all the answers

In which type of material can electric fields not pass through?

Metals Signup and view all the answers

What is the formula for the electric dipole moment (p)?

p = qd Signup and view all the answers

How is the dipole moment (p) oriented in relation to the charges?

From the negative to the positive charge Signup and view all the answers

What happens when an electric dipole is placed in an electric field?

A force or torque acts on it to align with the applied field Signup and view all the answers

What is the relationship between surface charge density (D) and the electric field in a dielectric material?

$D = \epsilon E$ Signup and view all the answers

In a dielectric, what does the term P represent in the expression for charge density (D)?

Electric polarization Signup and view all the answers

What occurs when very high electric fields are applied across dielectric materials?

Excitation of numerous electrons to energies within the conduction band Signup and view all the answers

What is the phenomenon of material failure due to high electric fields known as?

Dielectric breakdown Signup and view all the answers

What does dielectric strength quantify?

$E$ magnitude required for breakdown Signup and view all the answers

What happens when a dielectric material is present within the plates of a capacitor?

$D$ increases due to polarization Signup and view all the answers

What is the charge density between the plates of a capacitor when a dielectric material is present?

$D = \epsilon E + P$ Signup and view all the answers