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Question

Relative permittivity and permeability of a material are ϵr and μr, respectively. Which of the following values of these quantifies are allowed for a diamagnetic material?
  1. ϵr=0.5, μr=0.5
  2. ϵr=1.5, μr=1.5
  3. ϵr=0.5, μr=1.5
  4. ϵr=1.5, μr=0.5

A
ϵr=1.5, μr=0.5
B
ϵr=0.5, μr=0.5
C
ϵr=1.5, μr=1.5
D
ϵr=0.5, μr=1.5
Solution
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For a diamagnetic material, μr and ϵr should have following bounds 0<μr<1 and for any material ϵr>1

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