Engineering Jobs   »   Govt. Job Notifcation   »   electrical concept booster

Daily Concept Booster Electrical Engineering: Retentivity and Coercivity

Table of Contents


When a magnetic material is placed in an external magnetic field, its grains get oriented in the direction of the magnetic field. Which results in the magnetization of a material in the direction of an external magnetic field. Now, even after the removal of the external magnetic field, some magnetization exists, which is called residual magnetism. This property of a material is called Magnetic retentively of material.

• The units in which the retentivity of a material is measured is weber per square meter.



Due to the retentivity of material, even after the removal of an external magnetic field, some magnetization exists in the material. This magnetism is called residual magnetism of material. To remove this residual magnetization, we have to apply some external magnetic fields in opposite direction. This external magnetic motive force (ATs) required to overcome the residual magnetism is called the “coercive force” of material. In the above hysteresis loop -Hc represents the coercive force.

• The units in which coercivity is measured is ampere per meter and denoted as overset. It’s also known as coercive force or coercive field.


NOTE: In the BH curve of the hysteresis loop of material then the point at which the magnitude of H is zero and B on the Y-axis then, this point on B is called the retentivity of a material. Similarly, In the BH curve of the hysteresis loop, the point on the negative X-axis where the magnitude of B is zero and has some defined value on H, this value of H is called coercivity of a material.

Boost your preparation with the all-new Concept Booster Series by Adda247 Engineering Jobs, this series aims to target all the important engineering exams such as SSC Je 2022, GATE 2022, ESE 2022, and many more. Please reach out to us with your feedback in the comment section.


Sharing is caring!

Thank You, Your details have been submitted we will get back to you.
Was this page helpful?

Leave a comment

Your email address will not be published. Required fields are marked *