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Q.

The area of hysteresis loop of a material is equivalent to 250 Joule. When 10kg of a material, of density 7.5 gm/cm3, is magnetized by an alternating field of 50Hz, then the energy lost in one hour will be:

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a

6×104J

b

6×104erg

c

3×102J

d

3×102erg

answer is A.

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Detailed Solution

E=nAVt=nAmρt=50×250×10×36007.5×103=6×104J
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