Discussion
The constitutive relation for a linear isotropic dielectric is
Answer: C
Correct answer: \( \mathbf{D} = \epsilon_0\epsilon_r\mathbf{E} \)
Both factors are needed: \( \epsilon_0 \) carries the units and \( \epsilon_r \) describes the material, so their product is the absolute permittivity. Equivalently \( \mathbf{D} = \epsilon_0\mathbf{E} + \mathbf{P} \), which shows what the relative permittivity is doing - adding the polarisation to the vacuum term. The first option omits \( \epsilon_0 \) and is dimensionally wrong.
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