Question

Relative permittivity and permeability of a material are ε_r and  μ_r, respectively. Which of the following values of these quantities are allowed for a diamagnetic mateiral?
(a) ε_r = 1.5, μ_r = 1.5
(b) ε_r = 0.5, μ_r = 1.5
(c) ε_r = 1.5,  μ_r = 0.5
(d) ε_r = 0.5, μ_r = 0.5.

Answer 1

(c) : The values of relative permeability of diamagnetic materials are slightly less than 1 and ε_r is quite high. According to the table given, one takes
ε_r = 1.5 and  μr = 0.5. Then the choice (c) is correct.