First slide

Magnetic properties of matter

Question

The susceptibility of a ferromagnetic material is K at $27^{0} C$ . At what temperature will its susceptibility be K/2,

Easy

A

$54^{0} C$
B

$327^{0} C$
C

$600^{0} C$
D

$237^{0} C$

Solution

$B y C u r i e' s L a w, χ α \frac{1}{T} \Rightarrow χ_{1} T_{1} = χ_{2} T_{2}$
$\Rightarrow K (273 + 27) = \frac{K}{2} (273 + t)$
$\Rightarrow 273 + t = 2 x 300 = 600$
$\Rightarrow t = 600 - 273 = 327^{0} C$

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