First slide

Magnetic properties of matter

Question

The basic magnification curve for a ferromagnetic material is shown is figure. Then the value of relative permeability is highest for the point

Moderate

A

$P$
B

$Q$
C

$R$
D

$S$

Solution

for P
   $μ = \frac{B}{H} = \frac{0.25}{10^{3}} = 0.25 \times 10^{- 3} H / m$
for Q
   $μ = \frac{B}{H} = \frac{0.75}{2 \times 10^{3}} = 0.375 \times 10^{- 3} H / m$
for R
$μ = \frac{B}{H} = \frac{1.25}{3 \times 10^{3}} = 0.41 \times 10^{- 3} H / m$
for S
   $μ = \frac{B}{H} = \frac{1.5}{6 \times 10^{3}} = 0.25 \times 10^{- 3} H / m$

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