Dielectrics !

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45 Terms

1

Dielectric does not contain _______ electrons ?

free

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2

In conductor each atom contain atleast ____ free electron

one

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3

In Dielectric all the electrons are tightly bound to ____ of the atom

nucleus

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4

In Conductors all the electrons are _____ bounded with nucleus

loosely

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5

In dielectric the conduction bands are _______

empty

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6

In conductor the conduction bands contain _______

electrons

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7

In dielectric : The charge given to this is _______

localized

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8

In conductor : The charge given to this reside on the _______

surface

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9

In dielectric : The electron takes to and fro motion and just be around ________

nucleus

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10

In conductor : The electron takes translatory motion and can leave the _____

atom

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11

Dielectrics do not conduct _________

electricity

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12

Conductors conduct _________

Electricity

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13

In _________ there is no question of lossing the character and break down strength

Conductor

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14

The higher the breakdown strength, the better the material is at keeping __________

Electricity

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15

What are the examples of Dielectrics ?

  • Mica

  • Glass

  • Plastic

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16

What are the examples of conductor ?

All metals !

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17

What are the uses of dielectrics ?

  • Capacitors ( between the plates of capacitors )

  • Microwave Ovens ( Dielectric heating )

  • Dielectric Mirrors ( to enhance the reflectivity of mirrors )

  • Transformer Oil ( Dielectric oils used for cooling )

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18

Types of dielectrics ?

  • Non-Polar dielectrics

  • Polar dielectrics

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19

What is non-polar dielectric ?

A non-polar dielectric is an insulating material that does not have a separation of positive and negative charges.

<p>A non-polar dielectric is an insulating material that does not have a separation of positive and negative charges. </p>
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20

What is polar dielectric ?

A material that has a permanent electric dipole moment due to the presence of polar molecules. This property allows it to interact with electric fields and store electrical energy. Examples include water and certain ceramics.

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21

what is polarization ?

The separation of positive and negative charges within a molecule or object

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22

if the applied field is increased then sepration ?

increase ><

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23

what is permanent dipole moment

Permanent dipole moment is the measure of the overall polarity of a molecule due to the presence of polar bonds. It occurs when the molecule has an uneven distribution of charge

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24

A —————— is a measure of the separation of positive and negative charges within a system

dipole moment

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25

The dipole moment is ______ quantity

vector

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26

The formula of dipole moment ?

μ =qd

  • q is the magnitude of the charge

  • d is the separation between the charge

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27

what is polarization

the alignment of charges in an material is polarization

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28

formula of polarization ?

P=p/ΔV

  • P is the polarization vector,

  • p is the dipole moment,

  • ΔV is the volume.

<p><strong><span>P</span></strong><span>=p/Δ</span><em><span>V</span></em><span>​<br></span></p><ul><li><p><strong><span>P</span></strong> is the polarization vector,</p></li><li><p><strong><span>p</span></strong> is the dipole moment,</p></li><li><p><span>Δ</span><em><span>V</span></em> is the volume.</p></li></ul>
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29

the dielectric constant is also known as

relative permittivity

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30

the dielectric constant is nothing but ——-

how well material can store electrical energy

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31

the ________ is defined as ratio of electric displacement field (D) to the electric field (E)

dielectric constant

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32

the formula of dielectric constant

knowt flashcard image
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33

the dielectric constant is related to polarization through the formula of ?

knowt flashcard image
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34

What is E , P & D ?

E - electric Field

P - Polarisation

D - Electric displacement field

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35

What is electric field ?

force experience by positive charge divided by magnitude of the test charge

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36

Formula of electric field ?

E = F/q

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37

The polarisation formula ?

knowt flashcard image
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38

The ________ is related to both the free charge and polarization

electric displacement field

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39

the formula of electric displacement field ?

knowt flashcard image
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40

the relation between that all E , D , P ?

∇⋅D=ρfree​ where:

  • ∇⋅D is the divergence of the electric displacement field,

  • ρfree​ is the free charge density.

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41

The ___________ is a phenomenon where certain materials generate an electric charge in response to mechanical stress or pressure.

piezoelectric

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42

what are two interaction ?

  • Mechanical behaviours

  • Electrical behaviours

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43

What are the types of piezoelectric effect ?

  • Direct Piezoelectric Effect

  • Converse Piezoelectric Effect

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44

The ————————- refers to the generation of an electric charge in response to mechanical stress or deformation applied to a piezoelectric material

direct piezoelectric effect

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45

The _______________ refers to the mechanical deformation or displacement experienced by a piezoelectric material when an electric field is applied to it.

converse piezoelectric effect

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