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Q.

The mass of a specimen of a ferromagnetic material is 0.6 kg and the density is 7.8 x 103 kg /m3. If the area of hysteresis loop of alternating magnetising field of frequency 50 Hz is 0.722 MKS units, then hysteresis loss per second will be

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a

277.7 x 10-5 joule

b

277.7 x 10-6 joule

c

27.77 x 10-5 joule

d

27.77 x 10-6 joule

answer is A.

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Detailed Solution

The energy loss in a material is given byWH = V A v twhere y =volume of the material, A = area of hysteresis curve, v = frequency and t = time,∴WH=(m/d)Avt (∵V=m/d)=0⋅67⋅8×103×0⋅722×50×1=277⋅7×10−5 joule

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