Question

Magnetic permeability is maximum for:

• A. paramagnetic substances
• B. ferromagnetic substances
• C. diamagnetic substances
• D. all of the above

Answer 1

Answer: (B)

ferromagnetic substances

Answer 2

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.