Question

What is the magnetic permeability of Iron?

(a) 2.5 * 10^-1

(b) 2 * 10^5

(c) 1.26 * 10^-4

(d) 100

The question was asked in quiz.

This interesting question is from Miscellaneous Properties in division Properties of Engineering Materials of Engineering Material & Metallurgy

Answer 1

Right choice is (a) 2.5 * 10^-1

The explanation: The magnetic permeability of Iron (Fe) for 99.95% purity is 2.5 * 10^-1 whereas its relative permeability is 2 * 10^5. Permeability and relative permeability values, decrease for lower purity levels of iron.  The magnetic permeability of carbon steel is 1.26 * 10^-4 whereas its relative permeability is 100.