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Asked in GSEB Board July 2023 · Polarisation and bound charge
Idea: in an external field, each small volume of a dielectric acquires a net dipole moment, from induced dipoles or from permanent dipoles lining up.
The dipole moment per unit volume is called the polarisation, ⃗P = (Σ⃗p)/(volume), with unit C m⁻².
For a linear dielectric ⃗P = ε₀χₑ⃗E, where χₑ is the electric susceptibility — a different quantity.
So the quantity described is the polarisation.
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