Air & Copper have relative permeability of 1

Q.  Which among these materials have a relative permeability of 1?

i. Air
ii. Copper
iii. Iron
iv. Nickel

- Published on 30 Sep 15

a. i and ii only
b. i and iii only
c. i and iv only
d. iii and iv only

ANSWER: i and ii only

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