A) paramagnetic substances
B) ferromagnetic substances
C) diamagnetic substances
D) all of the above
Correct Answer: B
Solution :
Key Idea: Magnetic permeability is a measure of conduction of magnetic lines of force through it. Magnetic permeability is denned as the ratio of the magnetic induction \[(\vec{B})\]inside the magnetised substance to the magnetic intensity \[(\vec{H})\] of the magnetising field, that is \[\mu =\frac{{\vec{B}}}{{\vec{H}}}\] Permeability of diamagnetic substances is slightly less than unity, permeability of paramagnetic substances is slightly greater than unity, and permeability of ferromagnetic substances is many times that of air.
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