Dielectrics !

Dielectric does not contain _______ electrons ?

free

In conductor each atom contain atleast ____ free electron

one

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

nucleus

In Conductors all the electrons are _____ bounded with nucleus

loosely

In dielectric the conduction bands are _______

empty

In conductor the conduction bands contain _______

electrons

In dielectric : The charge given to this is _______

localized

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

surface

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

nucleus

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

atom

Dielectrics do not conduct _________

electricity

Conductors conduct _________

Electricity

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

Conductor

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

Electricity

What are the examples of Dielectrics ?

• Mica

• Glass

• Plastic

What are the examples of conductor ?

All metals !

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 )

Types of dielectrics ?

• Non-Polar dielectrics

• Polar dielectrics

What is non-polar dielectric ?

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

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.

what is polarization ?

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

if the applied field is increased then sepration ?

increase ><

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

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

dipole moment

The dipole moment is ______ quantity

vector

The formula of dipole moment ?

μ =q⋅d

• q is the magnitude of the charge

• d is the separation between the charge

what is polarization

the alignment of charges in an material is polarization

formula of polarization ?

P=p/ΔV​

• P is the polarization vector,

• p is the dipole moment,

• ΔV is the volume.

the dielectric constant is also known as

relative permittivity

the dielectric constant is nothing but ——-

how well material can store electrical energy

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

dielectric constant

the formula of dielectric constant

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

What is E , P & D ?

E - electric Field

P - Polarisation

D - Electric displacement field

What is electric field ?

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

Formula of electric field ?

E = F/q

The polarisation formula ?

The ________ is related to both the free charge and polarization

electric displacement field

the formula of electric displacement field ?

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.

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

piezoelectric

what are two interaction ?

• Mechanical behaviours

• Electrical behaviours

What are the types of piezoelectric effect ?

• Direct Piezoelectric Effect

• Converse Piezoelectric Effect

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

direct piezoelectric effect

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

converse piezoelectric effect