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Which of the following effects is predominant when a dielectric material is polarised?
Charged particles re-orientate themselves in the out phase with the electric field.
It makes charged particles free to move.
It makes charged particles free to move and causes current to flow in the material.
It causes current to flow in the material.
It makes charged particles free to move and causes current to flow in the material.
Polarization in a dielectric involves the displacement of bound charges from their equilibrium positions, creating a net dipole moment. While dielectrics are insulators, the transient movement of these charges upon the application of an electric field corresponds to a displacement current.
Polarization in a dielectric involves the displacement of bound charges from their equilibrium positions, creating a net dipole moment. While dielectrics are insulators, the transient movement of these charges upon the application of an electric field corresponds to a displacement current.
P=╧ЗeтАЛ╧╡0тАЛE тАФ Relationship between Polarization, Electric Susceptibility, and Electric Field
D=╧╡0тАЛE+P тАФ Electric Displacement field vector definition
When an external electric field E is applied, the positive and negative charges in the atoms or molecules are shifted in opposite directions. This microscopic displacement results in an induced dipole moment, and the collective effect of these dipoles is the macroscopic polarization P, which relates to the flow of displacement current IdтАЛ=dtd╬итАЛ.
Dielectrics do not conduct steady state DC current as they lack free charge carriers.
The flow mentioned in the context of polarization refers to displacement current arising from changing electric fields.
Electronic, ionic, and orientational polarization are the primary mechanisms in dielectric materials.
Used for energy storage in capacitors
Acts as an electrical insulator between conductors
Dielectric breakdown can occur at high field strengths
Dielectric loss leads to heat dissipation
Capacitor dielectrics
Insulating materials in power transformers
The official answer provided in the prompt is technically paradoxical because dielectrics are defined by having no free charge carriers. However, in the context of academic MCQs, 'current' often refers to the displacement current, which is valid for time-varying fields.
Option A is incorrect because particles do not typically orient out of phase; they orient to minimize potential energy.
Option B and C are fundamentally incorrect for ideal insulators, as they lack free charge carriers.
C is correct тАФ Although dielectrics are insulators, the displacement of charges in a time-varying electric field generates a displacement current.
Always distinguish between 'conduction current' (flow of free electrons) and 'displacement current' (rate of change of electric flux) when answering questions about dielectrics.
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