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. Coercivity 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

Hint:

The hysteresis loop describes the behavior of a magnetic material under changing magnetic fields, and retentivity refers to the remaining magnetism after the external field is removed.

Answer 1

The Correct Option is D

The correct statement is that the retentivity of a specimen is the amount of residual magnetism that remains in the specimen even after the external magnetic field is removed. The other statements are correct as they describe various characteristics of the hysteresis loop.