A) The curve of B against H for a ferromagnetic material is called hysteresis loop
B) The area of B-H curve is a measure of power dissipated per cycle per unit area of the specimen
C) Coercitivity is a measure of the magnetic field required to destroy the residual magnetism of ferromagnetic material
D) The retentivity of a specimen is the measure of magnetic field remaining in the specimen when the magnetising field is removed
Correct Answer: B
Solution :
The hysteresis loop i.e. area of B-H curve is a measure of energy dissipiated per cycle per unit volume of the specimen. It depends on the nature of magnetic material.
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