Question

Following materials are given

A) Nickel

B) Silicon iron 

C) Silver

D) Cobalt

Arrange them in ascending order of relative permeability

Choose the correct answer from the options given below:

1. C, D, B, A
2. C, D, A, B
3. B, D, A, C
4. C, A, D, B

Answer 1

Correct Answer - Option 2 : C, D, A, B

Relative Permeability:

A relative permeability \(\;({{\rm{\mu }}_r})\;\)is defined as the ratio of the material permeability to the permeability of free space (or vacuum \(({{\rm{\mu }}_o})\)).

MATERIAL	RELATIVE PERMEABILITY
Copper	0.9999906
Silver	0.9999736
Lead	0.9999831
Air	1.00000037
Oxygen	1.000002
Aluminum	1.000021
Titanium 6-4 (Grade 5)	1.0005
Palladium	1.0008
Platinum	1.0003
Manganese	1.001
Cobalt	250
Nickel	600
Iron	280000
Silicon - Iron	7000
Cobalt - Iron	10000
Ferrite core	100 - 2000