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Dielectrics

Question 1

Dielectrics are non-conducting substances, but it conduct electric influence

Question 2

Even in an external electric field the net electrostatic field in the conductor is zero

Question 3

Unlike in a conductor, electric field in the dielectric has same value as that of external electric field.

Dielectric and Conductors

Substance is placed in an external electric field

When a conductor is placed in an external electric field, charge redistribution happens until, in the static situation, the two fields each other and the net electrostatic field in the conductor is

In a dielectric, this free movement of charges is not possible, the opposing field so induced does not exactly cancel the external field. It only it

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Polar or non-polar molecules

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In a non-polar molecule, the centres of positive and negative charges

In a polar molecule, the centres of positive and negative charges

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Electric dipole moments

Both polar and nor-polar molecules develops dipole moments with different reasons

Question 1

In an external electric field, the positive and negative charges of a non- polar molecule are displaced in opposite directions

Question 2

When an external field is applied, the individual dipole moments tend to align with the field from the random manner

Electric susceptibility of the dielectric medium

Whether polar or non-polar, a dielectric develops a net dipole moment in the presence of an external field

The dipole moment per unit volume is called and

Polarisation per unit electric field intensity is known as the electric of the dielectric medium

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