Which statement about the relative permittivity εᵣ of a medium is correct?
Correct answer C. It is dimensionless and is never less than 1
Explanation
εᵣ = ε/ε₀ is a ratio of two permittivities, so it has no unit. It equals 1 for a vacuum and is greater than 1 for every material medium, so a medium always reduces the force.
Answer checked How we write and check questions
Discussion