Explain the terms polarisation surface charges and molecular polarisability for a dielectric material.
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Molecular
polarizability could be explained as following:
All molecules are dipoles, that has dipole momentum. Without electric field
these dipoles
oriented chaotically, so that total dipole momentum (Polarization) is zero.
As we turn on external electric field, the
se tiny dipoles reorient along electric field
, and so, they
more and more sums to total polarization vector. Stronger the electric field, more dipoles orient
along field, that’s why
푃
~
퐸
.
When dipoles near the surface reorient,
uncompensated
charge
appear on the surface. On one
side, it’s positive, on the other
–
negative
polarizability could be explained as following:
All molecules are dipoles, that has dipole momentum. Without electric field
these dipoles
oriented chaotically, so that total dipole momentum (Polarization) is zero.
As we turn on external electric field, the
se tiny dipoles reorient along electric field
, and so, they
more and more sums to total polarization vector. Stronger the electric field, more dipoles orient
along field, that’s why
푃
~
퐸
.
When dipoles near the surface reorient,
uncompensated
charge
appear on the surface. On one
side, it’s positive, on the other
–
negative
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