Answer to Question #128320 in Electric Circuits for Fariis

Question

What is a retentivity of a ferromagnetic material means?

A. The amount of magnetic field strength to saturate the ferromagnetic material
B. The ability of a material to retain its magnetism for a long period of time

Answer 1

Explanation & Answers

• Retentivity is how much of the induced magnetization a material may remain inside it even after the external magnetizing force is removed.
• This quantity is measured as magnetic flux intensity (T) at the absence of the external magnetizing force after the magnetizing process.
• In the B-H curve it's the value of Y axis (representing B in the graph) when x (the H value) is zero.

• And the ability of a material to retain its magnetism for a long time depends on some other facts like temperature, external vibrations etc.

• Therefore, none of the answers are appropriate for the given question.