First slide

Magnetic properites of materials.

Question

A ferromagnetic material is placed in an alternating magnetizing field. Area enclosed by the B-H curve is 8 $c m^{2}$ . If volume of the ferromagnetic material is 200 $m^{3}$ and 1 $c m^{2}$ area is equivalent to $10^{- 5}$ Joule, then what is the total lost energy in 1000 cycles?

Moderate

A

16 Joule
B

8 Joule
C

6 Joule
D

5.2 Joule

Solution

The area enclosed by B-H curve indicates hysteresis loss per cycle per unit volume.
$∴$ Lost energy $= (8 \times 10^{- 5}) \times 200 \times 10^{3} J = 16 Joule$

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