Question

Which of the following is not correct about relative magnetic permeability $\left( \mu _ { \mathrm { r } } \right) ?$

• A. It is a dimensionless pure ratio.
• B. For vacuum medium its value is one.
• C. For ferromagnetic materials
• D. For paramagnetic materials

Answer 1

Answer: (D)

For paramagnetic materials

Answer 2

: Relative magnetic permeability

$\mu _ { \mathrm { r } } = \frac { \text { magnetic permeability of material } ( \mu ) } { \text { permeability of freespace } \left( \mu _ { 0 } \right) }$

It is a dimensionless pure ratio and for paramagnetic materials $\mu _ { \mathrm { r } } > 1$