Question

Which of the following statement related to hysteresis loop is incorrect ?

• 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

Answer 1

Answer: (B)

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.