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Question
Write a relation for polarisation `vecP`of a dielectric material in the presence of an external electric field `vecE .`
Solution
The relation for polarisation `vecP`of a dielectric material in the presence of an external electric field `vecE`
`P=chi_eE`
where `chi_e` is a constant characteristic of the dielectric and is known as the electric susceptibility of the dielectric medium.
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